I trust Simon Borg-Olivier and his method. Simon is a physiotherapist, a very senior (30 years Iyengar,/ Shadow Yoga), and lectures at a leading Sydney university. He teaches a style of yoga that is very accessible to all people and is informed by advanced concepts of physiotherapy practice.
Some of the extra course materials have been delivered online in the last few years and this online content is massive, this includes anatomy course and advanced yoga fundamentals. Both these course are enough to learn over a few weeks each.
I have obviously done a few of his courses over the years in person and have no doubt the online course will be he best you can do. Check out yoga synergy’s sample content to see for yourself.