leader
https://vi.stackexchange.com/questions/836/what-is-leader
Vim is full of varIoUs commands, which are assigned to almost all keys on the keyboard.
But this causes a problem: Which commands can we use for our own commands,
without interfering with existing ones? And at this moment, the <leader> key comes into play.
Think about <leader>-key like a namespace for any user-defined commands.
You can assign any command to a mapping with a leading <leader> and you can be fully
confident that your mapping won't break anything.
By default your <leader> is \, backslash. You can check it with:
:echo mapleader
If this gives you an E121: Undefined variable: mapleader,
it means it's set to the default of \. If it gives you something else, then it's that
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