The meaning of the preposition de changes with context to mean either of, from, by, with or about.
of ➜ É de madeira. (It's made of wood.)
from ➜ De onde você é? (from where are you?)
by ➜ Vamos de carro. (Let's go by car.)
with ➜ Estou de relógio. (I have a watch.)
about ➜ De que você quer falar? (What do you want to talk about?)
When a verb comes right after de, they’re almost always in the infinitive. You would translate them as to talk, to do, to run ETC. OR ⇢ talking, doing, running. ETC.
de brigar ➜ Para de brigar. (Stop fighting.)
de falar ➜ Fico constrangido de falar. (I'm embarrassed to speak.)
de comer ➜ É a hora de comer. (It's time to eat.)
de falar ➜ Para de falar. (Stop talking.)