need help introducing kitten to cat!

hey there im new to this forum(hi all).

i moved house recently about 2 months ago and since them my 2 yr old female has been in fights with other cats(understandable as its their territory).

recently i brought home a kitten to keep her company. the kitten has settled in well in her safety room with all her stuff. we decided last night it was time to introduce them 2 each other.naturally my 2 yr old hissed and spat but she did not swipe just stared at the kittens every move.
Introducing them again this morning after they had both eaten my 2 year old made a swipe for the kitten. we've been punishing bad behavior and rewarding good in regards to the 2 year old but we are keeping them separate for now.

iv heard from various cat owners different things such as my 2 yr old will terrorize her until the kitten realizes who's territory shes on, or that if they don't get on they'll learn to tolerate each other.

what do u think is the best thing to do? please need help!

Positive reinforcement. When the kitten and resident cat are together play, and give treats. This way the resident cat only associates goodness with the kitten.

Just be aware that growling, hissing, swatting, etc are all COMPLETELY normal. Almost all cats will do this and they have to to an extent to establish who is alpha. It could even change once again later on when the younger kitten matures and might try to become alpha. You can't control this and it has to happen. The time to worry is if there is bloodshed or continuous chasing, rovoking, etc. Also don't ever bring one to the other or bring one in from a higher level to the other. Simply open the door seperating them and let them find each other. Don't punish bad behavior. Just seperate them if they act up. Reward the good behavior. Give them treats together.