I strongly agree with this, you already have enough math knowledge to learn how to do basic proofs. Hammack’s book is great, and it’s great that the author made

I strongly agree with this, you already have enough math knowledge to learn how to do basic proofs. Hammack’s book is great, and it’s great that the author made it freely available. I personally used Chartrand’s “mathematical proofs” and thought it was very helpful, I like it a little better than Hammack’s book, but they are both great for people getting started, particularly for self-study. You also need to talk to other humans about math on a regular basis - feel free to contact me, I love talking math! Contact info is in my profile.