how can i help my 6mnth old learn puppy etiquette??

so my 6 month old puppy is for the most part a VERY good girl. our biggest problem at the moment is that we/she does not have any doggy etiquette when greeting other dogs! she doesn’t really say hi and will just run up to the dog/s and play bow and bark just and immediately wanting to play- and she really doesn’t like or let other dogs sniff her bum (even tho she will sniff theirs after play has initiated). if she’s on the lead i have to basically drag her past the dog to ‘ignore’ it but she is just sooo interested in other dogs and would always prefer to play with them than any toy/treat i could offer. basically i just want to know how i can teach her doggy etiquette when greeting other dogs- specifically off the lead more so than on the lead as i know that more to do with being able to ignore other dogs walking past and focus on me. i just want her to be able to walk calmly up to other doggos and allow them to sniff her bum while she theirs before any play is initiated. or is this just a puppy thing that she will grow out of and learn herself? i want to be able to help her cuz it is definitely not ideal when she will run up to any dog within maybe 10 metres of us. i’d would be great if i could also teach her to ask my permission before greeting any dog (or person) too but i know that’s a pretty long way off.

Thanks in advance for any advice!