How do I make coins. Really need help

i need help with getting coins in the game the kind that buys skins

You can get free coins from shop’s treasure chests (open shop in any game and the two items in shop are treasure chests). they will give you random amount of coins when you open them, once opened you will have to wait for some time before you can open the treasure chests again.

But if you don’t want to wait you can purchase coins from the shop as well.