Geek & Sundry, created by Felicia Day, is a site devoted to RPGs, LARPing and gaming. The site includes numerous recommended YouTube videos and playlists for the new player.
WASD20 provides a Beginner's Guide to D&D 5th edition for the complete beginner. The Beginner's Guide is a series of YouTube videos featuring different aspects of D&D, including character creation and how-to play.