Ha! "Students" ? I don't see any students round here :laughing ... aren't youz guys all experts? :teeth
Front brake only zealots are missing quite a lot. The rear brake can do a lot to make braking safer ... and good for cornering too.
But for raw novices the front brake only advice I guess is not too bad ... but there's lots more to this. It's good to get new riders to really USE and TRUST their front brake and really know that 70% of braking happens there. ... but more to it... (and most here already know ALL THIS ... sorry)
Ever read that Mick Doohan interview where he talks about using rear brake? Interesting read.
Most racers use the rear brake judiciously, and educated street riders do too.
On my dual sport bike adding in rear brake really helps reduce front end dive. On my poor DR650 without the rear brake the thing won't stop!
Lightly dragging rear brake mid corner can help when you get back on the throttle. Less JOLT to rear tire, especially helpful on wet road. Common racer technique.
Upon corner entry, leaned hard over, light rear brake use can help tighten your line, prevent running wide. Another common technique. :thumbup