Usage patterns
話題を変えるto change the subject
It got awkward, so I changed the subject.
話題の〈物〉the much-talked-about ~; the currently trending ~
I went to try the restaurant that everyone's been talking about.
話題にするto bring something up as a topic
She brought up recent news as a topic.
話題が尽きないto never run out of things to talk about
I never run out of things to talk about with him.
Expressions
話題になるbecome a topic of conversation; be in the news; be talked about 話題を呼ぶattract public attention; create a stir; arouse interest 話題を振るbring up a topic; introduce a subject