How I self learn Python by myself

I learn python and AI by myself.. I only have few years software development experience on C++ and it was around 10 years ago. At beginning I just want to learn Python for fun. However, I realize that I can use Python to crawler web page to get the e-mail I need. So I start to do my little Python Program .. In this pervious , I only bought a simple Books and the rest is try and errors or search Internet as well as copy and pause . At that time , I do not know what is difference in List , Array , Dict ... ( I know how to use it , but I do not know what is the best way to do use it) But I still can finish my job. (few months later , when I check the old code , I know that I can modify it to get higher speed) A year ago , I am interested in Computer Vision. I start to search the Internet and try some code found in GitLab. But I still do not know how to do it. Then I saw a promotion on PyImageSearch . Then I decide to purchase the books. Even thought it is not cheap. However, I realize that it is good decision , after finish the study in 2 months. I got three project , one is to count the People and show the result in GCP (using Flask) , second is the Count the Egg. (Use traditional visual computing learned by PySearch Image Website) . Third is counting the fish and size I do not earn a lot of money in those three projects , but I have lot of fun and also help the customers to solve their issues. The key point I want to mention about learning the Python which I feel is important 1. A Basic Python book. The book is not expensive, but it can reduce the time 2. Find the project you are interested and try and error when coding. 3. Search Internet to see how the other person do. 4. Teach someone what you learn The try and error is more important part...