Basic Trope: A character demonstrates awareness of the particular conventions that usually govern stories and genres like the one they are participating in.
Straight: Bob, the lead detective in a murder mystery, arrives at what appears to be a suicide and notes that it is Never Suicide, Always Murder in cases that look like this, and thus suggests that this case is a murder. He is revealed to be correct.
Exaggerated: Bob is Crazy-Prepared and can accurately predict whether or not any snail he encounters will fall into a pool of lava and alligators from the size of its shell.
Bob has Psychic Powers (or something close to it) and can foresee the entire story.
Downplayed: Bob knows how things usually happen in detective stories, but he's hampered by a belief that This Is Reality.
Bob has a great deal of experience of the kinds of story he is involved in, whether as an active participant in previous examples or as a reader / consumer / producer of them.
Bob's in a story brought to life. He's read so many that he can essentially spot the transition at once, possibly because it's based off a story he encounterd already. Now that he is confirmed to be working within the realm of what he knows, He doesn't hesitate a second to play off genre conventions.
Inverted: Bob suffers Genre Blindness and has absolutely no understanding or awareness of the conventions of the stories he is in at all.
Parodied: At the beginning of the murder mystery, Bob is able to outline exactly how the story will progress, right down to who the likely suspects are, who didn't do it, and who will have ended up doing it, based entirely on similar stories. He's not wrong on any count.
Averted: Bob displays no overt awareness about the conventions of the story he has found himself in.
Enforced: "This is a pretty hackneyed trope / story we're putting together here; it'd be pretty funny if we had the characters acknowledge it."
"I knew this was going to happen."
Alternatively, "I've seen cartoons like this before!"
"First time I've ever seen a Spit Take in real life."
Invoked: The murderer is a fan of murder mysteries and is intentionally basing his crimes on the murder scenes in his favourite novels, thus deliberately engaging with and forcing Bob to engage with the tropes commonly found in murder mysteries.
Exploited: Bob is Dangerously Genre Savvy and is able to actively use his knowledge of genre conventions to uncover and defeat his enemies.
The murderer intentionally removes any trope-like elements to his crime, thus rendering Bob's Genre Savvy useless.