Can I set up a buy-one-get-one free (BOGO) discount?

Yes, we don't officially support it as a discount type but you can make a slight adjustment. 

For example, you can set up to buy any 2 products in a collection, pay a discounted price, or enjoy a 50% off discount. On the bundle description, you can write down the actual condition of your BOGO offer. 

One of the BYOB users is setting up a BOGO offer to sell tees and it's working quite well. 

Alternatively, you can use a discount code bundle to achieve it.