Fields and subfields are just one categorization, I wouldn't put too much weight on that. It is all connected, you can attack it from many angles. With maths I

Fields and subfields are just one categorization, I wouldn't put too much weight on that. It is all connected, you can attack it from many angles. With maths I personally need to really immerse myself and block out all distractions. Then I focus until my head is "full" for the day. Then the best course of action for me is to go for physical exercise (I run, bike, or swim.) I feel like this helps me digest what I've learned. Great learning resources can be old-fashioned books ;-) Preferably written by someone really authoritative in the field, and not just written to make a buck or for a course. For example, I really enjoyed Davenport's The Higher Arithmetic [1]. Original research papers, even if ~100 years old, can be really enjoyable too. What is your aim? To reach enlightenment? ;-) Or to solve/understand a particular problem? [1] https://www.goodreads.com/book/show/1874246.The_Higher_Arithmetic https://www.goodreads.com/book/show/1874246.The_Higher_Arith...