It can be quiet a science and curing can definitely make or break a good grow.
Crap drying and curing and you’ll end up either with a bunch of mould or shitty hay.
Each has their own prefered method but main thing is you don’t want buds going too wet into jars(mould)or dry (harsh smoke)
A rough guide would be to bend a stalk or two
If they snap easily buds are normally ready to get trimmed and put into jars to start the “cure”