Hey, I started speedrunning today with Celeste classic; Any advice ?

Movement is insanely underrated. Focus on your movement.

Make use of the practice mod to practice different levels individually.

Focus first on good movement and control before learning new strats and glitches.

The GIF database is very useful: https://celesteclassic.github.io/gifs/

Checkout the glossary: https://celesteclassic.github.io/glossary/

why did the clown with the advert link get more likes than me

Idk maybe bc you're the clown 🤡