The W3C offers a number of online training courses through this portal.
All courses follow a similar format: weekly modules include 'lectures' (i.e. instructive texts), usually with links to further resources, as well as some sort of activity. This might be a quiz or a Tutor Marked Assignment. A discussion forum allows participants to discuss the course with each other and with the instructors.
Instructors are always either some of those involved directly with the creation of the relevant W3C standard or others who have a close association.