https://docs.godotengine.org/en/stable/getting_started/first_2d_game/index.html

As typical as it is for the current indie game dev climate, making a 'Vampire Survivors' type game is probably a really good starting point for game development. 2D games are somewhat easier to make than 3D ones, so a 2D roguelike could be fun (but get's very complex very quickly) or a old-school Zelda styled game would also be pretty cool in my opinion while remaining fairly simple.

Here's are a couple other avenues to learn off the top of my head:

• Follow along with one or two of the large amount of tutorials they have for the engine and adding new features and gameplay mechanics to them when you feel like it.

• Think of a cool but simple idea and try to execute it yourself through trial and error, referencing the online docs and asking questions to the Godot game dev community.

It can be super daunting as there is a lot to learn. Try to learn by working on something that you yourself think is fun and that'll keep you more motivated :)

If you have some coding knowledge, this series of videos was amazing: https://youtu.be/mAbG8Oi-SvQ?si=Tyy2hjrdrvafSo6z

Not everything he does is right and some things he doesn't even understand that well, but it gives you a good idea into everything you'll need and you can then quickly learn how to expand from that.

What @dack said for your first game that is a great resource. If you wanted an overview of how the godot engine works later you can start from the Intro

To be fair it does have a huge plugin ecosystem that handles most of the common use cases, so it's a bit more than just an ECS, but the docs have some pretty big gaps in them so you could be excused for thinking it's more bare bones than it is.

Only for Godot 3, not 4?

Edit: Godot 4 supports C#, but only for desktop games, not web, android and iOS.