Alright since you wanted to know about the laptop jump, I thought I'd just put a comment here cause SRC doesn't appear to do replies to comments, but basically to do a laptop jump you have to jump once, open the laptop before you hit the peak of the jump (so when you still have upwards momentum), then close the laptop and hit jump again after closing the laptop. The timing on the second jump can be a bit finicky, for the bad ending jump it should be just after the laptop closes, but you might have to play around with it a bit. After you have your laptop jump timings down the only consideration of course is jumping from a distance where you get enough height to clear the lasers, which you should hopefully get a feel for soon enough. Also feel free to rebind controls to make the trick more comfortable for you, being able to open and close the laptop faster also helps get out of the laptop faster when picking up the glider in other runs.

That being said, I would recommend you check out ipie4fun's "Sludge Life Speedrun Tricks" video on YouTube, it covers not only laptop jumps but also the way to negate fall damage without touching the pipes in the bad ending run, and fast glider pullout for the other runs. Hope this helps, cheers and good luck!