the trailer says the course is a follow up of the mechanim course, https://cgcookie.com/course/fundamentals-of-mecanim-animation
but that course is in a later section of the flow. which one should i pick for starting?
They can be watched separately since they cover similar topics but much different animation types. The Mecanim animation course goes over the basics of creating animations in Mecanim and general Mecanim setup, so ideally this would be watched first. I'll add the Mecanim animation course first to avoid confusion.