Reddit mentions of Elementary Number Theory

While the hs and early college courses are critical; i found it more helpful to start with one of the more accessible proof based topics: such as elementary number theory (pdf), graph theory or combinatorics.

I like this strategy more because you might find these a lot more interesting, which helps a lot with the most important part of studying: consistency. Additionally, I find starting over a bit demoralising – and many algebra skills can be improved upon while working on something a lot more captivating, anyways.

If you tell me your interests, I can recommend you more specific beginner takes on certain topics.