Any number of ways really.
Glitches are typically found by people just playing the game and finding them by accident and then recreating what they did to find the glitch, or people are deliberately searching for glitches or anything else the game developers may or may not have intended.
Cheats/codes on the other hand were usually unlocked by meeting certain in game requirements, acquired by people who knew someone on the development team, or gaming journalists/reviewers would acquire cheats/codes by asking the developers themselves and then publishing the codes in their magazines.
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