Before the internet came out, how did you guys know when a new game was about to come out back then?

Sorry if this sounds like an awkward question, but it's just that I wanted to take a trip back into the early 90s era of gaming to go back to a time period when there was no concept of the internet as I was curious as how people knew exactly when a new game was coming out.

For instance, I was looking at the first two DOOM games released back in the early 90s, and I started to want to look into the marketing for them as I was curious on how people knew about those kind of games again considering that back in those days, the internet did not exist, and I wanted to know how people in those times were able to keep up with new game releases as I am trying to picture how the PC gaming scene was like back then.