How to quicker jump to function definition than C-h k ?

[Jean Louis]

I often wish to jump to function definition of a key and currently I
use `C-h k' flow, then I press `C-x o' to switch to different window
and again `TAB' to reach to the file where function is located, then
`RET' to reach finally to the function definition.

For my personal needs I would like to switch straight to the function
definition of a key.

Maybe such feature already exists, does anybody know how?

--
Jean

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