Learn from Websites-
The best Data Science learning hub because they provide large amount of tutorials related to Data Science ,Blockchain and Cloud Computing etc for fully free of cost.Even you can earn badges as achievement by completing the courses.
The competitive test also organize here you can participate and check your skills here.
Dataquest provide 30+ different courses for free of cost .The main key points of Dataquest is that you will learn by doing means after each tutorials they will help you to work on real world Data .
They also provide good assistance regarding career guidance in Data Science. Dataquest also help in to build up an projects.
Dataquest community is good and helpful you can share your doubts and work there .It is just like social media of Data Science.
Codementor is little different in compare to other learning website.You can say that codementor is online Tution type service for different technologies including Data Science where you can find mentor according to your need.
This service you can use as a trial but still Codementor provide good collections of tutorials and post regarding different topics which are free of cost to access.
Learn from YouTube Channels-
Data School provide rich video tutorials for Data Science from beginner to expert.You will get good contents according to your need there.
Sentdex is best place for learning python related technologies on YouTube. Sentdex provide good tutorials regarding Machine Learning and the tools that used in Data Science.
This another channel which provide rich content tutorials of Data Analysis.It is not very popular but still the person who is teaching is highly experienced.
4-Data Science for All-
The other New channel but high amount of videos tutorials you can get here.
Learn from Facebook Groups-
For facebook groups which i mentioned below are basically based on the number of post they provide daily related to Data Science and related technologies and number of members.
1-Data Mining/Machine Learning/Artificial Intelligence
3-Data Science World-