I want to learn everything related to position and global position. Is there a specific tutorial on this?

    RetroDan007x yes, the docs

    https://docs.godotengine.org/en/stable/

    you have the manual, it explains things with words.
    the getting started has 4 tutorials to get you started in 2D and 3D.
    and the class reference tells you what everything does, what functions and properties are available in each class/node.