Virtually all my teaching is online, in a dedicated tool. Of course I used slides and approach to teaching that i inherited from previous teachers of the course - which includes heavy use of polling using the builtin easy polling feature of our online class tool (collaborate ultra).

Once i taught a guest lecture in zoom. I ended up using directpoll.com to approach the polling features I'd normally use. Lots of yes/no questions, easily asked and answered (always same url, can watch answers coming in), some exercises.

Extremely positive response. Simple, oft-used interaction truly is a game changer - even if limited to yes/no.