Any suggestion to start learning modding?

[Essential Strategy]

Hello, I am new here and tried to start a modding project some days ago by learning from some tutorials I found here: https://trac.wildfiregames.com/wiki/WikiStart#Formodders: But my try was not so successful. It seems I cannot manually install mods in .local/share/0ad/mods for some reason, but I suppose it is because my game was installed from the software manager or something. I tried to find tutorials in previous posts but there are few and are not about first steps. I am not a neophyte on modding by the way, I have modded several other games before, although this is the first time I am going to use JavaScript. Any help would be thanked.