Create a new Branch

A new branch should always be created from an up to date main branch. That's why you added the BetonQuest repository upstream. Now click on your current branch in the bottom right corner, probably main. Then you click on upstream/main and click on New Branch from Selected.... Now give the branch a name that describes the changes you want to make and click CREATE.

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Next Steps

Now you are ready to make your changes! Either change Docs or Code, depending on your skills.