Confluence, the place where you do a bunch of documentation and then later forget you wrote it or can’t find it anymore and have to rewrite it all in a separate Confluence folder only to repeat it all later?
My team at work has several different team docs folders ranging from severely outdated to new but soon to be outdated
They’re super useful when running Proxmox. You can create an LXC container and have it booted to a shell in under a minute