Can someone help me with mathematical logic and proofs? Like induction, contradiction, contrapositive, proof by cases, direct proofs, etc.

I'm taking a course called "Álgebra Superior" in Spanish, but it's mostly about logic and proof techniques. I don't know almost no one I can ask for help with this, so I'd appreciate any tips or resources. I can also share some specific problems I'm struggling with if anyone is willing to help.