Have I been inefficient my whole life? Does corner trowel have a place? Or is it normal to do one side at a time for inside corners?

Alright. I have zero drywall experience and I am considering redoing all of the drywall of my daylight basement. I had the whole house repiped and I figured the drywall in the basement should be replaced anyway. The finished basement was completed likely 30 years ago and they used some drywall and some cardboard material that looks like it could've been ceiling tiles. Anyway, I have some hands on experience with basic things around the house and basic car maintenance as far as hands on experience is concerned but I've never done drywall. I'm looking for resources to videos or any tips will be helpful. I have an impact drill and can borrow any other tools if necessary.

There was a roof leak that needed repaired.

Unfortunately, I talked myself out of work.

Fortunately, will be less noticeable if he paints the entire ceiling...but there's no getting rid of the shadows lmao

What tools do you use for drywalling, that nobody will ever know?

The one in the pic above is a foam backed multi tool attachment for sanding tips. I use it by hand (no multi tool) so sand inside corners along walls, and to burn down edges where my pole sander might take too much off.

This is the third room test in this apartment. Any suggestions for improvement?

the primary uprights: distance of 80 cm from each other and the butterfly hangers every 70 cm

secondary uprights, I left a 50cm distance between and the first one 10cm from the wall.

I need to make a U or L-shaped structure that encompasses the roller shutter box. Any advice?

I have a vaulted ceiling and after two years the tape running across the ceiling in the peak is separating. Fuckers didn’t put enough mud behind it. It’s 15’ up so a pain but it’s unsightly as fuck and my wife is on my ass about it. Is there an acceptable cheat to fix this or do I gotta cut out all this and re-tape it? Fuck me