How can I create discount codes for my store?

How can I create discount codes for my store?

You can create your own discount codes in Shopify admin. This should be of help: https://help.shopify.com/en/manual/promoting-marketing/discount-codes/create-discount-codes

Here is a good example of how to create a Buy 2 Get 1 Free deal -  https://community.shopify.com/c/Shopify-Apps/Buy-2-Get-1-Free/td-p/476212