There's fully metal corner bead. Which needs to be screwed in.
Therewa also metal corner bead that has paper tape on it, and you mud it to the wall with a layer above, and below the tape.
Generally you butter wall thickly, then apply the corner bead. Then mud over it, then scrape it flat with your trowel.
Less mud is less sanding.
This is how I do it for metal or the vinyl but dont buy the edging that comes in a roll because the corner is prone to split.
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