I've found parenting teenagers harder than toddlers but definitely more rewarding, the parts in between that were bliss. I have a 20 year old and a 16 year old, so obviously only one teenager now but the other is still a student, and reliant on us for "stuff" so I still do mother him a bit lot
With girls, I would say be aware of their cycles and moods. I am more forgiving when I know it's certain times of the month. I think it's also important to make them aware it's because they're hormonal and not a 2 headed monster if they do face meltdown. I always make sure there's good chocolate and orange juice in the house for those times, it seems to be what works for us
I've never limited screen time, just told them what we think is sensible. If I felt it had taken over their lives, perhaps I would think differently, but they both have interests outside of screens that have not really made it an issue. I personally think if you deny people something, they want it more, especially when they inevitably get that freedom. I've also never linked chores to money. There's just certain things that are expected, like tidying up after yourself, doing your washing, offering to make cups of tea/coffee for anyone around if you're making one, and if I ask them to hoover/dust/empty the dishwasher I just ask them to have it done by a certain time that day.
Curfew we did have, but it was pretty generous, it seemed to be stuck to, but by the age of 17 with my son he was pretty much doing what he liked. He's got a good group of friends that live locally and we were fine with that. We still expect him to tell us if he will not be coming home that night either by text or beforehand, but I think that's just a courtesy of living under the same roof.
School work has been really important to us, but we've always let the kids know they're not doing it for us, they're doing it for themselves, and if they choose not to do the work, they are the ones who are going to suffer. We still had to stick the boot in sometimes. If we felt they weren't doing enough we would communicate with their teacher in whatever subject it was, to let the teacher know that we wanted them to work on it with them, that seemed to be enough to get my kids working again. I didn't think the degree my son was doing was the right one for him, I thought he'd be changing after the first term, and I told him so, but he was determined, and he seems to be loving it - sometimes you do have to admit when you're in the wrong and I've told him that I was. The hardest part of parenting for me has definitely been the stress of seeing one through 2 years of GCSE's and then on to A-levels and then straight on to it with another - what will be 8 years of preparing children for exams has been stressful and I will be glad not to have to do it again.
We were pretty young parents and didn't really have a plan, just felt it out as we went along and I'm glad we've done it that way. My husband and I don't take life outside of the obvious stuff too seriously. We try and have a laugh with the kids, there's a lot of things that we all share enjoyment in - I make sure there's food on the table, always let them know we are there for them, the house will always be an open door, but it's their lives to make and live and enjoy.