Firstly, the basics -
Learning how to shoot : Click your left mouse button.
How to shoot people : Move your mouse and click on their heads.

Good! Now that you've learnt the basics of how to shoot someone, it's time to use what you have learnt!!!

Step 1 - If you see someone, don't panic, what you must do now is, if someone is to your left, press the D button, or if they're to your right, press the A button, and move your mouse to their head.

Step 2 - Simply just click on their face until they die. (Please note : If you're in competitive mode in the heat of a battle and you click on their heads and don't die, don't worry, it's most likely 64 tick.)

Step 3 - If you managed to come this far (meaning that you lived and killed the enemy), it's time to relax and simply go up to the dead body and press ctrl as fast as you can for about 3 seconds and then run away.

Thanks so much for reading my guide on how to kill someone in Counter Strike : Global Offensive! Make sure you comment how helpful this is!