三人行，必有我师(焉)

In Cantonese it's used the way Mandarin uses 说, and 听讲 means hear about/hear tell.
Oh boy, that's confusing! I know I've seen 讲讲 for, like, talk about something, tell a story, as well, so it seems to have a variety of uses in Mandarin as well. Here I assume it's from 讲座, a lecture (a word I will never forget because I didn't know the word for lecture when I needed to use it in real life...).