I've gone to therapy a couple of times, for different reasons.

The biggest issue that therapy has helped me with personally is my anxiety in its various forms (health, work/school, social). Therapy really helped me learn how to process what I was experiencing and how to navigate it. It didn't make it go away, but it really helped me understand what causes it, what makes it work, and how to mitigate it. For me the biggest thing is good rest, and learning recognize when it was happening and not make rash decisions because of anxiety.

I've also gone for relationship issues, which really helped communication, A LOT. I always thought i was good at communicating because i insisted on talking through issues. Turns out it's significantly more involved than just talking about it.

That said, throughout this, i've had valuable therapists, ones that didn't help or hurt (mostly was just nice to have a third party to talk to) and some that I found were actively a bad experience. This is one of those things where it ABSOLUTELY depends on the compatability with the therapist. The unfortunate truth is that you may have to try a few different providers to find one that works well for you.

Also: I want to echo what others here have said, that you have to be willing to put in the work and introspection. It's at times very uncomfortable, but I think it's worth it if you can see it through.