Compile kodi?

Hi, I came from Android Kodi. I would decompile apk and edit xml, enabled unknown source by default and etc. Then compile and sign apk. When install apk, unknown source turn on by default and other customization I made would show too. In LibreElec, how do I do that? Do I need to "decompile"? But when I search, I only see "compile" or compile is the term in Linux they use? Is this where to start, "Compille" just to edit a few line here and their in kodi? Thanks

Quote from chewitt

Prove with evidence that you are not creating so-called "builds" or wizards full of pirate add-on crapware and we will consider further help. Sadly that is the main reason why people hack Kodi apks on Android, and we have no desire to see the same scumbags adopt our distro.

Does adding this Repo from kodi.tv [Release] Cambodian(khmer) video add-on consider a crapware?