1. Caer Bien:
When "Caer Bien" is used in relation to people, it generally means to have a good first impression of someone or to find someone pleasant or likable, typically upon first meeting them.
Example: Me cae bien Juan. Translation: I like Juan. / Juan makes a good impression on me. / I find Juan pleasant.
2. Gustar:
When "Gustar" is used with people, it typically means to have romantic feelings or a physical attraction to someone rather than just finding them pleasant or likable.
Example: Me gusta Juan. Translation: I like Juan. (In a romantic or physical attraction sense)
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