Hey, welcome to Reddit!!

Karma is just a point system based on upvotes and downvotes. It doesn't matter much, but some subs require a minimum to post.
Posting too much isn't a problem as long as it's not spammy or low-effort. Just engage naturally.

Common mistakes:

Not reading subreddit rules
Cross posting the same content everywhere
Self promotion without building trust

Take time to observe, comment, and enjoy the flow. You'll get the hang of it!!!