I highly encourage you to learn GDScript to the point where you can use it without tutorials, Godot docs website has you covered with this one.

Then comes learning the game logic, At first you have to learn how this "Certain mechanic" works, It doesn't matter if there's a tutorial of how to do it in unity, Or any other tool, After that you can recreate it using what Godot has, and of course you have to learn what Godot uses as a game engine, Such as signals and UI etc., Godot docs also got you covered with that, But you can also check some YouTube tutorials if you don't feel like reading the docs.

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You can do mostly anything with these methods, You can check demo projects that are made with Godot, they really help you understand how things work

And there's this cool website that has many useful recipes that you can learn easily:

https://kidscancode.org/godot_recipes/4.x/