>>11651351Mathematics is not a spectator sport. The best way to learn math is by doing math. You should dedicate most of your studying time to solving problems, instead of, let's say, reading textbooks.
Of course, you can't learn just by solving problems. That's where textbooks, videos and lectures come in. Now, not everyone learns the same way, and I think that's an important thing that you must keep in mind. I know people who hate textbooks, I know people who can't learn for shit with lectures, I know people who can only learn with textbooks, and there are many other types of people out there. You'll have to find out what works the best for you. Even when choosing textbooks, I think it is ideal for you to try out multiple textbooks and see which one you like the most, instead of just asking "what's the best textbook for X?". For a good amount of things, such as Calculus and Linear Algebra, Khan Academy does the job if you like videos.
I don't know what's your level of education, what you want to learn math for, or anything, but it's safe to recommend you to start with Calculus. Even if you aren't perfectly comfortable with high school level math, you'll learn it on the fly while studying Calc.
There's also one very good YT channel called 3Blue1Brown. You should definitely check it out.
Last, but not least important, this is the best coffee post I've seen in ages. I can't stop looking at the pic.