[dwild]

You get 10 reputations for each upvote you get and 15 if your answer is accepted. It doesn't take more than a few hours to get there.

There's plenty of simple question that you should be able to answer. Use what you know as tags, look out for new posts, and answers them using the best of your knowledge.

Do you get reputation over upvote on question? A few good questions should easily get 5 upvotes.

[apple4ever]

A few hours? I've been using SO suite of sites for years and only last year did I get over 50 on a single one

The reputation for commenting is way too high. I can't count how many times I could have contributed but for the silly reputation requirement. I've given up trying to contribute.

And based on the answers I've been seeing, it doesn't serve it's purpose anyway.

[KabaKun]

Earning reputation on Stack Overflow can be a really slow, tiring process. As others have mentioned, suggesting edits is one way to get there. For each that gets accepted, you earn +2 rep. I earned 25 rep this way and it was a slog.

The easiest way to get 100 rep on SO, though, is to get 200 rep on any other site on the network. This is called the Association Bonus. Enjoy movies or cooking or video games or board games? Go post questions/answers on those sites and get some votes. There are 170+ sites on the network and because they're lower-volume, earning rep is often faster because posts are more visible.

I'm not sure which sites you've tried so far, but it is possible to do and even have some fun doing it.

[dwild]

Well then I have been incredibly lucky because I only contributed twice, on simple questions and I got more than 50 without even thinking about it.