Comment by tonymet

I agree. Wikipedia Cleanup is a good starting point. Or look for a Wiki Project to join.

I've found the best way to learn and contribute is to jump into an existing project. Usually direction is the hardest thing .

You can of course dive into an article and make changes, but you'll often get pushback (warranted or unwarranted) and that can be discouraging. It's a somewhat natural feedback loop.