For stick technique and rudiments, Bill Bachman.
He doesn't have all his videos for free on YT, but there's a lot. I took his 2 week free course offer to soak up and download his lessons as much as possible.
No one "teaches" better than he- most others talk way too much; play too short a time to grasp completely; don't provide the "student's perspective" as well in their explanations or demonstrations-- I could go on and on. Bill speaks what is needed, walks through each step of the techniques in clear detail, visually shows exactly what he is speaking about close up, repeats instructions multiple times do ensure absorption. You can easily interact with his lessons, several times, a very hands on approach.
Some of the drummers mentioned might be very good drummers, but mediocre teachers, assuming they are imparting knowledge simply by speaking out too quickly their lessons or buzzing through a technique so quickly the fine points are glazed over.
Not so with Bill, who IMO is simply the best at teaching the material he does.