What to display on my second monitor?

What should I display on my second monitor (related to the game I'm playing, of course)? What can I display on my second monitor?

I'm playing on a self-hosted VaultHunters server.

you could use dynmap and have your world map

Tippon reply

This is what I do, or if I'm playing with the family, I put the map on the TV while we play on our laptops

Relaxing game on monitor one, twitch or youtube on monitor two.

Minecraft wiki (the actual one over at https://minecraft.wiki/, not what’s left behind on fandom.com)
Pictures/how-to video of the build you want to make, or build inspiration pictures
World map
Nothing, just because you have a second monitor does not mean it always needs to be in use

If you have to ask then you don't need it while playing. Turn it off. Don't waste the electricity.