Almost every subreddit has rules, and we do too. We get lots of posts about politics, LGBT, what if, and just basic trolling, all prohibited by our rules. Also, the Rules didn't match the Removal Reasons, but now they do. We added a "Moderator discretion" rule, because it's impossible to create rules to cover every contingency.

r/stupidquestions can be a fun and interesting place to hang out, but we had lots of trouble recently with people trolling us with rule violations. So a couple of the users suggested putting in a minimum Reddit account age limit and a minimum karma limit to post. That has made things much nicer for the community. Karma is sort of an artificial number, but it tends to indicate that the owner interacts with Redditors in a positive way, and they appreciate him. What you want is to post something that Redditors appreciate so much that they give you a few upvotes. Here's Reddit's FAQ page about karma:

https://www.reddit.com/r/karma/wiki/index/faq/

Here are some ways to get karma:

https://www.reddit.com/r/karma/comments/lg0ntj/here_are_subreddits_where_you_can_farm_karma_with/

We don't reveal the karma number required to post. It's not very high, though.

Thanks. Now go forth and have fun!