I went to a coaching clinic recently where the Yale head coach (who also coaches special teams) was talking about technique for kick coverage. He was talking about pad level, staying in your lane, taking on blocks, etc. . . .
. . . and essentially what I got out of the talk was that good athletes are going to be good on kick coverage, and bad athletes won't. All the "techniques" he was talking about were basically just natural instincts. And while some of the moves the guys on film were making were actually moves that would be affected and make sense, special teams is largely just athletes making plays.
There's some technique to it, but mostly, you just put your fastest, most aggressive, biggest guys out there.