Now, you can find websites with walkthroughs, trainers, etc. But pre-Internet, players had to find other ways. Feel free to share what you used to do. In my case, some computer stores that sold the games would have a bulletin board with notes from various customers asking about one level or obstacle to bypass in an adventure game, and so forth. Sometimes, I'd call friends over the phone and ask for advise. Very few used BBSes, and those become more prominent locally only by the late '80s.