"green tea decaffeinated", so that means there is no caffeine 0 % in that green tea am I right? if yes plese explan answer thank you.
Decaffeinated tea is tea that has no caffeine in it. Its main ingredients or compounds are polyphenels, which are suspected to give the tea its healthy benefits. It also contains catechins, which include EGCGs.
Decaffeinated means caffeine is removed. It is not necessarily caffeine free. Decaffeinated coffee still has caffeine - just less. If you don't want caffeine, look for "caffeine free".
It has less caffeine, probably almost none, if it's decaffeinated. You can get no caffeine tea by drinking chamomile tea and many other varieties.