I was told this is a simple and easy way to change your fov. I will start with saying what it is. If you type fov 90 in console(~) that is your default. As you raise your fov your vision of what you see gets bigger. Lots of players use fov 100, fov 110, fov 120. If you go to type fov 110 after using fov 90 for several months your screen,aim, and jumps WILL seem very odd. So instead of going from fov 90 to fov 110. Just add 1 fov every day for 20 days so it feel normal to you. Raising your fovs gives you a better advantage since you can see more at once.
-Bix