Why should you change your crosshair?
Changing your crosshair can improve your game, as the default one may not be optimal for everyone. You can greatly improve your crosshair’s visibility by tweaking some of the available settings. Your crosshair should be visible in any map environment but at the same time it should not be distracting and so big that it blocks your view.

Crosshair Examples on Dust_2
What can you change?
Here is a small overview of settings you can change and why you should

Style
You can choose between 6 different crosshair styles:

0 = "Default Dynamic" - Spreads when moving / shooting & limited customization

1 = "Default Static" - Static & limited customization

2 = "Classic Dynamic" - Spreads and splits when moving / shooting

3 = "Classic Dynamic" - Spreads when moving / shooting

4 = "Classic Static" - Static

5 = "Classic Hybrid" - Spreads when shooting

Newer players should stick to a dynamic crosshair style as they learn the game because it shows them when their shots will be accurate or not.

Console command example:

cl_crosshairstyle 5

Size & Thickness
Depending on your display resolution you should tweak those settings so that your crosshair is visible but not too big.

Console command example:

cl_crosshairsize 2

cl_crosshairthickness 0.5

Overly large CSGO crosshair

This size won't fit all
Gap
The gap between the crosshair lines shouldn’t be too high, as you might have trouble aiming in long distance fights.

Console command example:

cl_crosshairgap 1

Outline
Enable crosshair outline if you want to improve your crosshairs visibility even further.

Console command example:

cl_crosshair_drawoutline 1 -- (enables/disables outline)

cl_crosshair_outlinethickness 1 -- (outline thickness)

Alpha
This setting changes the opacity of your crosshair. We want be able to see it, so keep it at the maximum value (255).

Console command example:

cl_crosshairusealpha 1 -- (enables/disables custom alpha values)

cl_crosshairalpha 255 -- (crosshair alpha/opacity)

Dot
I would recommend using a dot only with “thin” crosshairs as it would block too much of your vision otherwise.

Console command example:

cl_crosshairdot 1

T-Crosshair
This option removes the top line of the crosshair, which doesn’t make too big of a difference but you can give it a try to see if it suits you.

Console command example:

cl_crosshair_t 1

Sniper Crosshair
Increase the width of your sniper crosshair while scoped-in if you have trouble spotting it. Especially players that use a 4k resolution in-game can benefit from this.

Console command example:

cl_crosshair_sniper_width 2