Always edit the "key" with a bind of your choose. I personally recommend keys that you don't use.

First you need to activate the Developer Console on Options in-game.
After that, use the accent below your ESC, that might looks like it: '
Then, create your bind writing this on Console: bind <key> "<function>"

Examples:
bind x "+voicerecord" - now this bind starts your microphone
bind c "holdpos; buy awp" - every time you press C you start a Radio Command calling to Hold Position and buys an AWP

If you have suggestions or want me to create a bind for you, just comment it.

The phoon's sons

Now you can use your smoke correctly

So you finally use the smokes in any spot

The lineup bind below
Change the "x" to your original crosshair value - you'll find this value on config.cfg or inside the Crosshair section in-game. Can write "cl_crosshairsize" on Console before changing it, btw.

Mute all the voice including your teammates - good for clutch

It's a toggle bind. Press once to Mute and again to Unmute.

For those who like to play in the left hand or right hand when needed

It's a toggle bind. Press once to get the opposite position of your hand, and again to return.

Helps you hearing footsteps while walking

Just change "SHIFT" for a key that you may want to use it.

Better for Deathmatch

It's a toggle. Press once to activate, and again to deactivate.

A good way to check FPS and Frags.

Will change between 4 modes