You can’t really make green beans from scratch. However, if a recipe calls for green beans, heck yeah, add them in. You can also make green beans all by themselves, in a variety of ways. You can eat them straight from a can, if you want. Not the best way to eat them, but it’s an option.
Another option is to boil them and cook them with some garlic and some other spices. Some black pepper, some salt, perhaps. If you can’t think of anything to make with green beans, there are a couple of ways to find recipes. One is to ask your family, but the other is to look at the internet. There are thousands of recipes online that include green beans, or that can be used to make green beans the star of the show.