A good starting point is to download a mod, analyze what each component does, preferably using Visual Studio Code or a similar program, understand the folder structure, the XML standards, image formats, etc.I have good news, we have a community mod started by Stan about World War II using models from another open-source game.https://github.com/0ADMods/pyrogenesis-1944 That would be a great start; download this mod, update to alpha 28, and try getting the French Civic to work, for example. We have manuals for mods, and almost all questions have already been asked in the forum, which is a good place to do so, but if anything new comes up, feel free to ask here. Also, as mentioned above, there are now AIs are relatively good at small tasks for the average user, but I advise understanding them beforehand.

I’m honestly not an expert developer myself and rely heavily on AI for reference, so if you have specific questions, AI can provide quick answers, alongside the advice you get from the forum, of course. This mod is still in its early stages, so I’m not sure how successful it will be.

Hello, good work. I got attracted by 0 A.D. because of modding capabilities. I want to bring to life a project I did for a game called Rusted Warfare RTS. It is about WW2 and i think everything I need is possible in 0 A.D., without several limitations on the engine and liceses I had in the previous game. The thing is I am strugling a bit with modding, as there are not clear or complete guides nor tutorials for modding the game. I tried to ask where to start before in this forum, but responses were not very helpful... I would thank you a lot for any help.

I have been inspired by you.

Definitely the best choice.