There are sooooo many keymappings in Neovim. I frequenly see folks post one without any explination of what the command is called or what it actually does. I knew how to use `:map`` to get a listing of my custom keymaps. Took me a bit to figure out that the help docs work for built in commands.
For example, use this in Normal mode figure out what Ctrl O does:
I feel silly for not realizing that the docs would have it so directly. It's a nice reminder to myself to head to them whenever a question comes up.