What do you need help with?

With all the messages from scammers trying to steal your money, I thought a thread to ask genuine questions would be good for beginners, and veterans alike.

As the title says, what are you having difficulty with? Anything that this community can give an ELI5 on?

There are no stupid questions. A benefit of having a sub like this is a mixed spectrum of users. Let's help each other to grow and become more knowledgeable.

Off topic, this 500 character rule is understandable but really annoying. Anyway...