First time playing CS:GO I only use default Crosshair in the settings section. After a few days I was browsing I finally found out how to replace Crosshair easily.
First search "Crashz 'Crosshair Generator" or Click Here.


Then click Subscribe .


Run CS:GO game .


On main menu, Click Play > Find A Game > WorkshopSelect the Workshop > Start Local Server .



Test Crosshair

In the Workshop you just shoot the Crosshair section or the settings you want and it's very easy.
And to save you only Exit from the workshop.


And that's how to replace Crosshair CS:GO easily.