Fifth Harmony's Camila Cabello has always been super insightful, essentially wearing her heart on her sleeve.

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She has shared her favorite Roald Dahl quote on Twitter and has explained why women should always support each other aside from gushing over hearing her group's song "Worth It" on the radio with her pal Taylor Swift, among a sea of other great moments since turning 18.

Cabello turned 18 on March 3 and Swift even threw her a rad party. The important thing though is that the 5H member has learned so much since turning the big 1-8.

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On Sunday night the singer gushed, "[I] wrote a thing!!!!!!!!!!!!!!!!!!!!!!!! wanna see it."

Her "thing" is called "12 things I learned while being 18."

Then in a TwitLonger she explained in great detail those "12 things," which includes an array of things from "kisses are the best form of communication" (that's No. 3) to "be kind to people" (that's No. 11).

Why are kisses "the best form of communication"? Well, according to the 18-year-old 5H member they allow you "to say everything words can't express."

Why is being kind to people so important? It's common knowledge to treat people well, but a lot of the time that doesn't always happen; however, Cabello thinks it's an extremely important thing to do no matter what since it could make someone's day.

"[B]e the one that answers the phone when nobody else does," she stated in her TwitLonger, which lends itself to the idea that it's nice to make others feel good.

We love how open Cabello is. Her "12 things" TwitLonger is like talking to a dear friend late at night when neither of you can sleep since you have so much on your minds.

Which of the "12 things" do you value the most that Cabello has learned at 18 so far?

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Fifth harmony, Camila cabello