I am a new merchant in Shopify and was wondering if there is a way to program a sale, like 10% off or buy one get one free, into the check out in my store?
Any info will be appreciated.
Welcome aboard! You can create automatic discounts that can pretty much do what you need (they come with a variety of options and you can access them from the Discounts link from your store's menu). You can learn all about them here.