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the forum gives me an error and does not let me edit the post. I wrote confing instead of config in a row.
you usually put it inside an autoexec.cfg file and set the CSGO startup settings on steam to make the game always have the autoexec.cfg loaded...
I improved it again, every time I press the down arrow it enables and disables the "duckjump mode": alias +DuckJump "+duck; +jump; -forward;...