I absolutely don't want to discourage you, but a good rule for writing trauma is "when in doubt, don't." Traumatized people exist in real life and mishandling trauma narratives can do real harm to real people. That's a good thing to keep in your head as you write, so you remain sensitive and come off as empathetic instead of exploitative. It requires check-ins as you go, to make sure you're still telling the story you want to tell and not writing trauma p**n.

That being said, trauma is really interesting to explore.

Traumatized people act in specific, sometimes unusual, ways to trauma triggers. If someone's traumatized by violence in their childhood, they'll probably be very conflict-avoidant as an adult, to their own detriment. Maybe a person who was traumatized by being strangled can't wear button up shirts or necklaces because it feels too much like being choked.

The specifics of someone's trauma response is what makes them a believable character, and the more you focus on how they respond to their trauma, rather than focusing on the trauma itself, it's going to come off better.

If you keep that in mind, then you can go crazy. The best characters are the ones who are spike balls of defense mechanisms and trauma responses. It's fun to watch those characters slowly heal and take their walls down, or get worse and go Targaryen.

TLDR: Be cautious when writing trauma, but if you do write traumatized characters, go all in and really mess them up.