As Robert already outlined, let me describe bit a little further, read following :
you can clone/download , so you will screw-up only your repo and make modifications using notepad or by more sophisticated tools - https://desktop.github.com/, or check https://www.youtube.com/watch?v=Fhgga2s_RmM
to test it, you can install it via CLI - [HOW TO] CLI install method
If it works for you, you can publish changes - Pushing changes to GitHub from GitHub Desktop - GitHub Docs
When you will be installing via CLI, never do uninstall - simply install via CLI, in case it will not work, install without uninstalling version from Homey store.
But it’s not always so easy, sometimes it’s about updating product ID, sometimes it’s about complete code changes.
Also note this is thread for Tuya devices, so we are OT.
