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ModusPonens

There's a great collection of lecture notes on mathematics and physics form Cambridge University that is linked on reddit.

https://www.reddit.com/r/math/comments/csgigv/collection_of_lecture_notes_on_mathematics_and/

It has notes on almost every topic, beginner, intermediate, and advanced.

There's also a great collection of notes from Oxford University. The Oxford link is to their home page, and the Cambridge link is to a cloud service.

https://ln.sync.com/dl/1f4af5c40/9hi9gt4i-evpn76tq-badt8eaz-ckxem3zf

https://courses.maths.ox.ac.uk/overview/undergraduate

Cheers!