が vs に vs で vs な vs の

が (ga) - subject marker, "the (thing/person) that..."
に (ni) - location, time, direction, "to/at/in"
で (de) - location of action, "at/in/by"
な (na) - connects adjectives to nouns, example: 元気な人 (genki na hito) "An energetic person."
の (no) - possessive, "of"