How do you get skins in counter strike?

The only way I know to easily get CSGO skins is either from opening chests or to use gamehag.

You can get the weekly drop by leveling up in csgo, but it's also possible to get graffiti and cases. But there's still a chance of skin. Other than gamehag, you can try others. All I can say is like csgopoints or clickloot, they are both legit and gave me skins, no gambling nothing. Just do tasks, buy stuff from there and yeah. Not sponsored but just thought you want to know.

there is one more app on Android, idk about IOS, named GoCases, you are getting points by playing other games and then opening the cases.

weekly drops cases gamehag etc

Open cases or buy them on the marketplace.