LearnCAX, which is the academic/education related arm of CCTech has released a lecture series on Gambit.
They are videos with collated information on power-point slides accompanied by a detailed audio discussion and description.
You will have to register on the LearnCAX website to access the tutorials, and this hardly takes a few minutes and brings the benefit of being notified when LearnCAX release other material/news. LearnCAX is based in Pune, but accessible globally because they offer online courses related to CFD, and CAD (and other things). Check out their website.