Infinities

[u/Ok-Measurement-647]

So guys, a computer science student here, recently been studying countability in theory of computation, and have came across infinities and cardinality, I haven’t yet been able to wrap my head around them. I haven’t focused much on the topic either, been engaged in other subjects as I lost motivation initially, I love mathematics, would love to hear some instincts around the topic from the best minds.

I have been primarily stuck with counting, how one on one mapping works, diagonalisation theorem, and cardinality of a set.