Welcome to the forum =) I have not had many nightmares in general but I used to have a few. But ever since I started to pay attention to my dreams and practice my awareness of the dream,
I have had more stable dreams and very few nightmares, well what I call nightmare now is probably not what people would define nightmare either so.
Last night I dreamt that a woman pointed a gun to my head and I was kidnapped, but it wasn't scary it was more like watching a movie, I know it's a scary theme but I don't get scared.
This frightning feeling have completely disapeared since I started lucid dreaming.

There are written tutorials on this forum on how to lucid dream, but if you rather would like to listen and see examples "inside" the dream world this is the best beginner guide according to me.
Learn lucid dreaming: part 1 - YouTube

Lucid dreaming can help you get rid of nightmares. You can for example have a nightmares about skeletons chasing you (sorry for giving your mind ideas ) but then realize it's a dream and just get a baseball bat and kick their a*ses the only downside is that if you don't get lucid but only a little more aware and not relizing it's a dream, well then it increase the terrifying feeeling :/
But when you start practicing you will later on get lucid immediately when a nightmares occurs because it's you will be critical to what you see.

Good luck =)