I'll start with a few and then you are free to add more

• You qan stick to ceilings by holding down the jump key. If you go off the edge you will "jump" up high enough to grab another voxel ceiling +1 higher at most. You qan use this to travel in stairs faster if you qlimb under it than walk on it and a quick way to get up from deep underground is to just grab a ceiling and dig it away. If there's no voxel above to grab then you'll fall down again so be qareful.