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Drywall taping corners  3. Embed the tape with a taping knife. Center the tape with a light pass of the knife, then apply more pressure to smooth the tape and remove excess mud behind it. Tapping the tape with your finger should leave only a slight indentation. Drywall Corners, Drywall Tape, Drywall Repair, Plaster Repair, Drywall Mud, Home Building Tips, Building A House, Diy Home Repair, Home Diy
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Taping and Finishing Drywall Corners - Fine Homebuilding

The trick is to work on half of a corner at a time.
Fine Homebuilding