Check out example codes for "how to get a list of folders in a directory godot". It will help you in understanding the concepts better.

Code Example 1

func list_files_in_directory(path):
    var files = []
    var dir = Directory.new()
    dir.open(path)
    dir.list_dir_begin()

    while true:
        var file = dir.get_next()
        if file == "":
            break
        elif not file.begins_with("."):
            files.append(file)

    dir.list_dir_end()

    return files

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