How to pick up Weapons, Items and open Doors

So for the people who dont know, there is this secret feature that you are never shown in L4D2, this guide will help you become insanely good, but it is a bit hard to do so make sure you have the skill to press a few buttons.

How to pick up

Ok so if you want to be able to perform the action of picking up items and opening doors, you MUST press down the letter E of your keyboard while looking at the object you would like to pick up or open, BUT you must be close to the object before tapping E to interact with the object.

Where is the E key?

Ok so as you can see in this picture below this text you can see a keyboard with a red circle on it.
The red circle shows where the E key is. you MUST press down that key in order to interact and you may change the button to interact in the settings (sadly i will not have tutorials for those).

Thank you!

Thank you for looking this guide, i hope this makes you really good!