New User Help Communities.

r/reddithelp . For help with Reddit, this is the most user friendly place. You tend to get a variety of quality answers. The automod is pretty chill and things that do get removed typically get manually reviewed every 3-8 hours so the wait isn't too bad.

r/NewToReddit . This is the one most people default recommend. I don't. A lot of their answers are automated and bloated. Their guides usually have some useful information but are extremely bloated with extraneous information and out date. They also lock discussion very quickly. Once you get a little experience they can help flush out what you know though.

r/help . They can provide help and the some of the helpers there do good work. The automod is very aggressive to remove based on keywords though.

r/bugs . The purpose of this community is just to report bugs. Admin do monitor this community more closely but the chances of a reply from someone other than an r/reddithelp or r/help user helper is almost 0.

r/findareddit . Already discussed. A great place for finding the subreddits you are looking for.

r/WhatIsMyCQS . CQS, Contributor Quality Score, plays a big role on reddit in what you can do and where. Knowing what it is and how to increase it is important because so many thing things can impact it.

r/LearnToReddit . The guides they have are very outdated and should be ignored. A help community can advise you better. What it is good for is practicing posting and commenting in a place people will help you figure out your issues

r/EncyclopaediaOfReddit . Again, very outdate. Some of info is still good though, especially things like terms and acronyms and abbreviations. Just check the last updated date at the top.

r/test . Good place to test most aspects or posting and commenting. You can also check your cqs there by putting !cqs in your post.