can I use FaceTime for education - to teach my students'?

I use freeconferencecall.com supports up to a 1,000 users. Works on a wide range of devices. I've had 10 users at the same time... android , ipad, macos and windows. It is best to have a wired connection or a wifi connection.

R

FreeConferenceCall is video as well.

No you cant because your all students have to apple product. I dont know the capaticty of face time.