# AddonName, __name__ will print the folder name

class AddonNamePreferences(bpy.types.AddonPreferences):
    # the id of addon in preference
    bl_idname = __name__
    attributeA: StringProperty
    attributeB: StringProperty

# it is also the name for bpy.context.preferences.addons[KEY] reference. just the name w.o version
bpy.context.preferences.addons[__name__]
bpy.context.preferences.addons[AddonName].preferences.attributeA