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Steal a copy of a textbook on libgen then read it. Try the exercises, if you can't do them then find out what you need to learn. This certainly works for physics (Obviously don't start with a graduate QED textbook).

http://abstract.ups.edu/download/aata-20160809.pdf try that for size.

Another good resource, except for the latter parts only being obviously useful for physics: http://www.staff.science.uu.nl/~gadda001/goodtheorist/primar...

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