I saw this a while back, so I coded up a really bad JavaScript page that I dumped a whole bunch of protips for the system we use, the campaign we're playing, and then just some general tips and jokes that are system- and campaign-agnostic, and I run that page on OBS while I'm getting set up.
We play Pathfinder and Starfinder mostly, but some other systems as well, so I can switch which system we run tips for when I start it up; and I can switch the campaign, too.
The campaign-agnostic ones are stuff like
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Having trouble with an encounter? Try reducing the enemy's HP to 0 while keeping yours above 0.
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It's not "Getting the rules wrong." It's just temporary improvised homebrew.
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Lesser-Used Magic Spells: Lamashtu's Unholy Waters, Tasha's Hideous Laughter, Frank's Hot Sauce
Pathfinder 2e just did a remaster to pull all of the OGL stuff out of it, so I added a bunch of the stuff that got renamed to the PF2e tips section:
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~~Spell Level~~ ➡️ Spell Rank
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~~Mephit~~ ➡️ Scamp
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~~Material Plane~~ ➡️ The Universe
And then for our campaign-specific stuff, it's an opportunity to insert a little flavor or reminders that people might forget.
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For the best deals on armor and weapons, come on down to Ivan the Armorer! "If you need a smith, just bellow for Ivan!"
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Deep in the jungles of Castrovel is the mystical Temple of the Twelve, where you met a Lashunta woman named Ralkawi. She's pretty grateful for that.
Some of the stuff ends up getting a laugh. Others are just good to remember.