I started in Data Science back in 2015. It was not an intended move but the answer to the needs of my employer. I was working for a company providing automation services to Spanish corporations and we had the need to leverage data to automate complex tasks whose rules could not be easily hard-coded. I had recently graduated as an engineer in the middle of a terrible economic crisis, had some statistical modeling knowledge and was proficient using MATLAB.

In 2015 there was not specialized Data Science degrees or boot-camps to jump-start in the field (at least, in Spain) and the naturally closest studies you could have were, in this order: Mathematics (in Spain with a strong focus in becoming a teacher/professor in the public education system) or Software Engineer (most of them more interested in App Development or creating the new Uber of “X” than in boring Data Science stuff back then).

With this context, most Data Science practitioners were a bunch of recent graduates from mostly quantitative degrees (lots of engineers from diverse branches, and people from economics and similar degrees). In this context I found some precious online resources which helped me back then and, in the long run, made me a better Data Scientist today (2020).

To become a Data Scientist you need a combination of things like:

• A quantitative degree (not strictly mandatory, but helps).
• Practical knowledge about the tools and technologies used. This is something you can get in a specialized boot-camp like the one me and Pedro teach.
• Practical experience on real-world and relevant projects. This is the most important point of this list and the hardest thing to get.
• Being surrounded by excellent professionals. As my old boss used to tell me: if you are the smartest guy in the room, you should start worrying.
• A good understanding of how Data Science works, including a theoretical knowledge of how data structures, systems and algorithms work under the hood.

This last bullet point is the focus of this post. The online courses I am going to present you here are those focused on getting the theoretical foundations of Data Science. Those courses have some common features:

• Are not the typical DataCamp nano-course you can complete in an hour while commuting. Those are long, hard courses you have to invest time in.
• Are taught by excellent professors from top universities.
• Are very valued in the sector, by companies, recruiters etc.

Those courses are not going to make you a Data Scientist, but while you practice your skills with real-world projects, learn the tools needed, etc., those courses will set the foundations for your success as a Data Scientist in the long run, and will set you apart from mediocre Data Scientists who train Machine Learning models and write code but have no idea about what is really happening and why.

This is important to bear in mind. As opposite to other posts and listings recommending Data Science courses, this one have two advantages for you:

I have done each course listed here and my reason to recommend them is they are worthy based on my personal experience. I will attach the corresponding certification for every course to prove my words.
None of the courses authors are sponsoring me to list their content here obviously.

Let’s start, in chronological order…

1. Introduction to Computer Science and Programming Using Python

This is a truly excellent course by professor Eric Grimson from MIT. As I had some MATLAB experience one of my first goals as a Data Scientist was learning Python. When I took the course, the content was made for Python 2, but it has been recently updated to Python 3.

The interesting thing about this course is that it introduces important concepts about Computer Science that are usually set aside by many Data Scientists, for example:

• Data Structures
• Computational Complexity (Big O notation)
• Object Oriented Programming
• Algorithms
• Recursion

If you are an experienced Data Scientist with no Python knowledge, should consider taking this course as it is now the standard.

2. Introduction to Computational Thinking and Data Science

This is the second part of the previous course. It has a strong focus on programming applied to statistics. You can expect coding lots of simulations. Lots of fun.

3. The Analytics Edge

This is a good course by professor Dimitris Bertsimas. It focuses on a mix of Machine Learning and optimization algorithms with some visualization using ggplot. Course content includes:

• Linear Models
• Decision Trees
• Random Forest
• Clustering (k-means)
• Linear Programming
• Some NLP (a bit outdated nowadays)

All content is taught in R language.

4. Machine Learning

No introduction needed for this course. This is probably the most famous course about Machine Learning and a big contributor to the hype about ML over the last years.

This course is taught by the famous professor and AI advocate Andrew Ng, from Stanford University. The course is excellent and focuses on explaining most popular Machine Learning algorithms, including its math foundations.

This is one of the most valued courses in the field.

Back in 2016, this course was taught in MATLAB/Octave. I read recently that they are working on an update from MATLAB to Python, but this update has not been released yet.

5. Learning From Data

This interesting course by professor Yaser S. Abu-Mostafa from Caltech goes very deep into what statistical learning is, why it is feasible and how to do it the right way, covering in depth aspects like bias-variance trade-off, overfitting, regularization, validation, theory of generalization, etc.

It explains the foundations of Machine Learning in a theoretical and rigorous manner, not recommended for those without a mathematical background.

Its contents are based on the eponymous book.

6. Deep Learning Specialization

This is the famous Deep Learning Specialization by Professor Andrew Ng and his new educational venture, deeplearning.ai, and one of the most valued certificates in the field today.

This is a long specialization of 5 courses focused on Neural Networks, one of the most important algorithms nowadays, and the best to work with unstructured data (images, sound, text, video, etc.).

It goes from the foundations and math behind Neural Networks in the first course to hyper-parameters tuning, project planning and strategy, convolutional architectures and, finally, sequence models architectures.

The courses are highly structured, rigorous and foundational, as well as practical, with lots of real use cases.

These are the top quality courses I recommend you.

Nevertheless, they are not the only courses I have done since I started in this field. I am always taking some kind of course, sometimes even two at the same time; most of them are about Data Science, although I sometimes broaden my knowledge about other topics as well such as Urban Design, Energy, among others. Maybe I will cover this topic in another post if there is interest.

You can check the full list of courses I have completed in my LinkedIn profile.

There are some courses that do not qualify to be in the section above but worth mentioning…

1. Introduction to Deep Learning

This is a course at the Higher School of Economics of Moscow. Is not listed above because it is very broad and not very structured, but being broad can also be one of its advantages.

If you are looking for a short introduction to Deep Learning which covers lots of architectures without paying too much attention to the math behind it, and don’t want to spend some months going through the full Deep Learning specialization from deeplearning.ai, this is your course.

The final project is building an application able to generate captions for images, very interesting and fun.

2. How to Win a Data Science Competition: Learn from Top Kagglers

This is a different course of Machine Learning. If I could only take a single course about Machine Learning in my life and had to choose one, I’d choose this one.

This course comprises an overview of almost all you must know to be an efficient Data Scientist, covering important topics like:

• Exploratory Data Analysis.
• Lots of different ML algorithms, from a practical point of view (when, and why you should choose one above other for a specific task).
• Techniques like Mean/Target Encoding.
• Lots of real examples from Kaggle competitions, explained by competition winners and Kaggle Grandmasters like Μαριος Μιχαηλιδης.

Although this course is focused in competitive Data Science (Kaggle competitions) which differs from real industry Machine Learning projects, not only getting the best score is important (but inference speed, maintenance, robustness, etc.) you can get ideas to improve your Machine Learning models.

3. AI for Medicine Specialization

This very recent specialization by deeplearning.ai is about how to apply Artificial Intelligence to the Healthcare Sector.

Given the current situation of the COVID-19 outbreak, it is needless to say that public and private efforts are moving towards searching innovative solutions for this public health crises.

AI applied to Healthcare is considered nowadays a greenfield and the most promising sector to be in the next decade (from a Data Scientist point of view):

AI will not replace doctors, but doctors using AI will replace those who doesn’t — Andrew Ng

Over the last years, there has been considerable development of AI solutions in sectors like Marketing, Customer Management, Energy, etc., but the Healthcare Sector has always lagged behind because of reasons like:

• Administrative barriers related to data privacy and ethical considerations.
• Lack of interest in a fairly traditional sector where communication between physicians and technologists is not always easy.
• Algorithm performance is so critical (people’s lives are at stake) that AI implementation must be done very carefully.

This recent pandemic has changed public perception about health data usage and both governments and the public opinion are much more willing to explore the possibilities of AI in the Medicine field.

This specialization is structured in 3 courses, covering:

• AI for Medical Diagnosis: learn how to identify diseases based, for example, on medical images.
• AI for Medical Prognosis: learn how to predict the future health of patients.
• AI for Medical Treatment: learn about causal inference, randomized control trials, model explainability. This is the less interesting course of the specialization, and, as it is fairly new (May 2020), there are still some bugs in the assignments.

Those courses are not very difficult from the technical point of view, but it is a good thing that you have some previous experience as a Data Scientist if you are going to take this specialization, as it focuses on explaining critical differences between traditional AI and Healthcare AI. There are many differences like:

• Specific performance metrics for Healthcare.
• Deep Learning architectures suitable for Medical Images segmentation.
• A strong focus on Survival Analysis.

If you want to remain a Data Scientist in 10 years, in a very competitive environment where general Data Science is becoming a commodity, you should take this specialization.

Thanks for reading this post, I hope this information will help you to advance your career or learn something new.

PS: Thanks to Miriam Cañones for her feedback while writing this post.

This post was originally published in my personal website and blog.

1. David Adrián Cañones. "The online courses you must take to be a better Data Scientist". Jun 17, 2020. Accessed on Sep 22, 2020.