Programming in general - What programming concepts have given you trouble?

Question

Good programmers are, by nature, problem solvers and logical thinkers. No matter the language(s) you code with, programming is essentially programming and we as programmers must tackle the same concepts.

With that said...What are some of the concepts in programming that have given you trouble? What helped you to understand?

Answer 1

Pointers, and this has helped me to understand them:

https://code.sololearn.com/c7mW3DQoz3m0/?ref=app

Answer 2

It took me a while to understand prefix/postfix (++i/i++). 😲
↓This gave me the ah ha moment↓
https://stackoverflow.com/questions/5413548/java-prefix-postfix-of-increment-decrement-operators

In Java: I'm now having trouble trying to set and get an array from methods outside of the arrays method, if that makes sense(maybe it's not possible?).🤔