Lydia Crowder demonstrates how to tape drywall, focusing on butt joints and flat joints. She emphasizes the importance of properly pre-filling gaps and using the right consistency of mud. Lydia uses paper tape and taping compound to ensure a strong bond to the wall and provides tips for a smooth finish. She advises against using mesh tape with certain compounds and emphasizes the need for even pressure and proper alignment. After taping, Lydia recommends checking for any heavy edges or imperfections to ensure a smooth base for further coats. Overall, the tutorial provides valuable tips for anyone working with drywall.