What is the best way to fill larger gaps between plasterboard?

Regular filler, paper tape, latex etc? Preferably avoid cracking

Gaps between drywall sheets on a ceiling, showcasing boards and screws, questioning best material to fill gaps to prevent cracks. A gap between drywall boards secured with screws, showing the need for filling methods like putty or tape to prevent cracking.
 
N
There were significant gaps. I had filled the gaps with plaster filler (powder mixed with water), then applied tape and spackled with LH filler.
 
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N newbee said:
Those were substantial gaps. I would have filled the gaps with gypsum filler (powder mixed with water), then applied tape and filled with LH filler.
Thank you, I will try this.
 
the one who did the plastering should get a folding ruler
 
Probably need a ruler too and some patience.

Protte
 
I can understand that there will be gaps since no angle is straight, so patience is definitely required.
 
Husfix works too,
 
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