Either I misunderstood what I was told on my CBT or was told wrong but when I first started riding my bike I only used the front brake thinking that was what I should be doing.
Only after taking a lesson from a different instructor was it drummed into me to apply the front brake first, then the rear, bringing the speed down releasing the front (below approx. 15/20mph) so as not to get the 'bounce back' from the front brake which happens at low speeds. This applies to a normal slow down/stop.
The improvements in all of my riding was unbelievable purely because I was using the correct braking procedure.
Speeds under 15/20 mph then it's rear brake only. The improvement in stability was amazing.
Emergency stop is as others have said.
Always squeeze & never snatch the lever.
I was also told off for 'covering' clutch and/or brake levers.
The advice given on this forum is first rate, I've learned a lot from reading the posts. I must admit though, even after 40+ years of driving I struggled to adapt to a bike & the second instructor taught me so much in the 2hrs lesson.
My riding improved so much just by following three bit of advice he gave me.
1: Keep my head up.
2: How to brake correctly.
3: How to position my feet on the pegs.