Here are some Resources regarding Geometry Dash
RobTopGames Website: https://robtopgames.com/
Geometry Dash Demon List: https://pointercrate.com/demonlist
Official Geometry Dash Discord Community: https://discord.gg/geometrydash
GDColons Tools:
GDBrowser: https://gdbrowser.com/
GD Icon Kit: https://gdbrowser.com/iconkit
GD Comment Generator: https://gdcolon.com/gdcomment
GD Font Generator: https://gdcolon.com/gdfont
GD Spritesheet Splitter: https://gdcolon.com/gdsplitter
might add more later, if I missed something important or links are wrong you can write it in the comments.
MegaHack