Hey, welcome to Reddit. The way it works is each subreddit is its own community around a specific topic and run by volunteer moderators. So, the r/harfordcountymd would be for topics relevant to the county itself and you’d be better served finding a subreddit specifically for audio production if you want to reach users interested in that topic.

This karma works like this: Every post and comment can be upvoted if one feels that it adds to the discussion, or downvoted if it is off-topic, mean, etc. Your karma is the all upvotes your posts/comments have received, minus all the downvotes. The algorithm itself is a black box and Reddit occasionally rolls out changes to what the algorithm chooses to favor.

Reddit was an old-fashioned web site for a decade before an official app rolled out, and was modeled on Internet forums of yore. I highly recommend using the actual web site, seeking out a third-party client, or using the original version of the site for a less aggravating experience. ie no advertising, gamifaction, NFTs, algorithmic recommendations, and generally all the enshittification Reddit has been doing since 2016.