Learn Spanish (Latin America): ¿Qué colores te gustan?

In Spanish, the verb gustar actually works more like "to be pleasing to". Since the things that are pleasing here are the colores (plural), the verb has to be plural too. That is why we add the -n to make it gustan.

What does the te do in this sentence?

te means "to you" for someone you know informally. Because gustar literally means "to be pleasing to", you need te to specify who the colors are pleasing to. The sentence literally asks: "What colors are pleasing to you?"

Why is the plural of color written as colores instead of just adding an 's'?

In Spanish, when a noun ends in a vowel, you just add -s to make it plural. But when a noun ends in a consonant, like the 'r' in color, you must add -es to make it plural.

Why does Qué have an accent mark over the 'e'?

In Spanish, all question words like qué, cómo, and dónde get a written accent mark when they are used to ask a question. This helps tell them apart from identical words that are used in normal statements.