Giveaways, Trading, Begging, and Coupon Threads are not allowed.
No chat logs & phishing attempts. We have all seen or had an interaction with a phishing attempt. We don't need to see the same thing continually.
No pricing Errors/Oddities/Steam Store bugs. Glitches happen ("-999%"), Publishers think they're slick ("-1%"). Etc.
No Steam Tags.
No Steam Status notices after someone has already submitted them. Check to see if someone has already mentioned Steam being down before posting.
Bandwidth/Download Speed Glitches: Occasionally Steam will show an insanely high speed of download. Don't post it. It happens.
No rage comics, memes, "reaction" images.
No Steam Wallet referral URLs
No threads about issues with Steam: See the Weekly Support Thread.
No images about friend requests from bots: There's nothing we can do about it.
No Steam Support ID's. No Steam Support employees browse this subreddit, nor do they give precedence for members of our community.
Moderators can remove threads at their own discretion.
No advertising Steam Groups.
No Steam Reviews - Report them through proper channels.

A more detailed rule-book can be found here.

If you are having issues with a specific game make sure you "Verify Integrity of Game Cache" which can be found when you right click on a game->Properties->Local Files.
PC Gaming Wiki has many useful bug fixes.
To move games between drives (such as SSD to HDD), try SteamTool or SteamMover.
Bulk categorize your games using Depressurizer
Enhanced Steam Extension for Google Chrome and Mozilla Firefox that adds many new features to the Steam website.

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