The straight cut
First of all, do a low ponytail by securely tightening an elastic hair tie:
2- While maintaining your head really straight, let the elastic slip slowly towards the ends. Tighten closer as it becomes loose.
3 - Stop a little higher than the spot where you want to cut. If necessary, tighten the elastic again.
If your hair is too short, ask someone you trust to continue.
5 - Hold your hair at the point of the elastic hair tie base and make it slip to the spot where you want to cut, then go ahead!: