To answer all your questions would require a book LOL. Video is tech bindings with boots that have metal inserts in the toes. Lightest of the setups but not the best for release if you fall. The toe pieces can foul with ice so take a small screwdriver to clear the bindings before downhill .
If your going to do "once in a whiles " go with a rail binding ,heavy but safer release characteristics . They can foul as well.
I don't believe Tele bindings have the adjustable cant angle for climbing with skins but someone will chime in if I'm wrong .
Lots of techniques for uphilling , steep vs mellow .
Have fun researching .
https://www.evo.com/guides/how-to-bu...uring-bindings