One healthy way is to have an honest conversation. Sit down, look each other in the eye, and talk about what went wrong and how to avoid it in the future. For example, my friends once argued over money. They made up by having a calm talk about their financial goals and how to work together towards them.
Another way is to give each other some space first and then come back with a small gift or gesture. It could be a book the other person has been wanting or a homemade card. My sister and her partner had an argument. After some time apart, my sister made a photo album of their memories together and gave it to her partner. This simple gesture helped them make up and feel closer again.
Doing something fun together can also be a great way to make up. Maybe go to a new place you've both wanted to visit, like a park or a museum. It gives you a chance to create new positive memories. I know a couple who had a fight and then made up by going on a picnic in a beautiful garden. They focused on enjoying the moment and each other's company, forgetting about the argument.