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This question already has an answer here:

Many commands need the Leader key, but I can't found out what is that key on my keyboard. How could I test it out?

marked as duplicate by muru Feb 19 '17 at 8:46

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If you don't set one, the default leader is the backslash \

You can set your leader with :let mapleader = "x", for example to make x your leader.

It's handy to set this at the top of your .vimrc to whatever your desired leader is (I use space as mine). See :h leader for more info and examples.