>>12646021what level do you mean "basics"?
basics as in 1+1? basics as in you did math in highschool?
start being more specific about what level you are actually at.
also, you will never know "the complete field", there will become a point where you will have to choose what area interests you the most: and go down that route.
Unironically though: khan academy. its good basically from high school math until the end of undergraduate (ive never looked at it beyond that.
I would recommend starting with basic algebra, then moving onto calculus (at the sort of level 16-18 year olds are doing).
After that: you get to the undergraduate level. you should look for basic modules that certain universities offer in first year and try to find textbooks for those courses.
After that you should definitely know which direction you want to go in, and should be able to work it out yourself
Once you get good at that
if you are doing this in your spare time learning math will take a long time (longer if you are a retard, which is possible if you dont know basic math)
the key to learning mathematics is resilience: you wont learn it if you dont keep trying
