Logos Bible Software has done several webinars that provide excellent introductions to the platform for new users, as well as providing useful suggestions that more experienced users might find beneficial too. Current webinars are listed below. For a full playlist, and to sign up to be notified about future webinars, please see the Logos website.
Not all webinars are available for Logos 7, but some things have changed very little in Logos over the past few versions. The webinars below appear to be the most current ones on the listed topics.
Logos Survey (v7)
Master the Basics of Logos Navigation (v6)
Get the Most Out of Your Logos Library (v5)