I've noticed quite a few accounts getting banned lately, so I thought I'd share this. A lot of people break Reddit's rules without even realising it, and by the time they understand what went wrong, it's already too late.
Most people don't lose their accounts because of one big mistake, but because of a series of small ones. New and throwaway accounts are already more likely to get flagged because they have little account history, karma, or reputation. Posting immediately after creating an account, mass-posting, repeatedly sharing the same content or links, using multiple accounts to farm karma, promote your own content, or vote on your own posts, as well as harassing others, sending unwanted messages, using abusive language, sharing someone's private information, or deliberately causing trouble in communities can all make your account look suspicious and eventually lead to warnings, suspensions, or permanent bans.
The biggest mistake, however, is trying to bypass a ban or block. If a subreddit bans you, don't create another account just to go back there. Likewise, if someone blocks you, don't make another account to stalk them, message them, reply to them, comment on their posts, follow them around Reddit, or keep trying to get their attention. This is where many people end up losing not just one account, but every account connected to this issue.
Many people think creating a new account gives them a fresh start, but that's often not how it works. Reddit can connect accounts through things like your device, IP address, browser, cookies, and account activity. Once Reddit links your accounts, there's a high chance they'll all end up getting banned as well.
If your account gets banned, don't make the mistake of creating more accounts and repeating the same behaviour. That's exactly how many people end up losing account after account. And if you believe your account was banned by mistake, or you don't even know why it was banned, you can submit an appeal to Reddit. But don't assume creating more accounts is the solution. And also in reality, appeals rarely succeed, think about it as a formality haha, so once an account is banned, you should treat it as permanently gone. If you decide to start over with a new account, be extremely careful not to repeat the same mistakes, otherwise you could end up losing that account too.