• If we met in-game, don't be afraid to send a friend request.
• If I don't recognize you from in-game and you don't tell me why, I won't accept.
• I'm not interested in a romantic or sexual relationship.

21 year old disaster. Have you seen my pronouns? I think I've lost them...

Phishing

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• Never enter credentials into windows where the address bar says "about:blank".
• If a login page appears in a new window instead of a new tab, be on high alert even if the address bar looks legit. Websites can show anything they want within the rectangle that composes the viewport, including extremely convincing fake popup windows. Here's a detailed video about this attack if you want to know more.
• Never change the email address of any account of yours to one you don't control.
• Never enter one-time passwords (usually 6 digit codes sent via email or SMS) into websites or apps you wouldn't trust with your actual password.

Linux, Wine, and Proton

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• All Valve games except the first Left 4 Dead and The Lab support Linux natively without Wine/Proton. This includes Half-Life: Alyx, even though it is not indicated on the store page. [steamdb.info]
• Wine and Proton are not usually called emulators; they are usually referred to as compatibility layers. There is no hard line between an emulator and a compatibility layer, so it is not strictly speaking wrong to call them emulators, but it will sound wrong to most knowledgeable people.
• "Wine" is no longer an acronym, so do not say "WINE".
• Linux is not an operating system; it is a kernel. Linux is used in a large number of operating systems (called "Linux distributions" or "Linux distros") which are mostly compatible with each other, and thus the term "Linux" is used as an umbrella term to refer to (most of) them.
• Linux users don't need to do complex rituals to play games. They (usually) install the Steam client the same way you do, then they click "Play" and it (usually) just works.
• Usage of the terminal is not required to use most Linux-based operating systems, though it can be beneficial.

Cheats and anti-cheats

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• Many but not all forms of cheating in multiplayer games can be eliminated with strict serverside validation and thoughtful network protocol design. Unfortunately, many games do this poorly.
• Most cheaters cheat for the purpose of trolling and griefing, which is why cheating and toxicity are highly correlated. People sometimes cheat for other reasons.
• It is reasonable to be cautious of future cheating from people you know have cheated in the past, but phrases like "Once a cheater, always a cheater" and acts like immediately banning/blocking people with VAC or game bans of any sort are not constructive.
• Using the word "hacking" to mean "cheating" or "creating cheats" is not exactly wrong, but it can be bothersome to people who use the word "hacking" in more positive ways.

Miscellaneous

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• "Code", when referring to computer code, is an uncountable noun, so do not say "codes". One must use a unit of measurement such as "lines of code".
• "Lua" (the programming language) [lua.org] is not an acronym, so do not say "LUA".
• HTML is not a programming language; it is a markup language. That's what the "ML" stands for.
• Unicode includes all of the characters in ASCII, so it is incorrect to say "Unicode characters" to mean "non-ASCII characters".
• One doesn't need GitHub or any other service to use Git. Git repositories can be completely offline.
• Git and GitHub are not the same thing. GitHub is a service that provides a number of features useful to Git users, such as hosting your repository's files, issue tracking, a fancy web interface for doing things normally done in Git itself more easily, crowdsourced wikis, and static site hosting.
• Steam is not an Electron app. It makes use of Chromium Embedded Framework for most parts. It used to use VGUI for most of the interface (which is the same thing used by most Source engine games for their UIs), but it now goes unused under normal circumstances.