I don't understand questions like this. You have the entire internet to search, powerful search tools, libraries, bookstores, etc. You're asking about the most

I don't understand questions like this. You have the entire internet to search, powerful search tools, libraries, bookstores, etc. You're asking about the most basic building blocks of a subject (akin to asking "How can I learn about arithmetic?"), of which there must be an effectively infinite amount of material aimed at beginners. The best answer to your question is "Do anything. Anything at all".