Bridgebase Online - Quick Start by Karen Walker: https://kwbridge.com/bbo.htmThe BBO Tutorials tab on ACBL's Video Library page site offers excellent videos on a wide range of topics, from a basic BBO tour to tips for playing with robots.
Sagamore Bridge Club -- Excellent video instruction hosted by Silvana Morici
Tutorials from Paul Gipson -- This site has videos for beginners and experienced BBO players