Some common romance tropes found in romantic movies and books are the following:
Forbidden love: two people fall for each other. However, they cannot be together due to their families, societal norms, or other external factors.
Love triangle: the main character has two love interests, and they must decide between them.
Enemies-to-lovers: two characters start off disliking or hating each other, only to fall in love by the end of the story—usually because they are forced to spend time together.
Fake relationship: two characters pretend to be together for various reasons (e.g., because they are afraid to tell their conservative parents they are single), and eventually they fall in love.