props.children composition

card.js

import React from 'react';

function Card (props) {
  return (
    <div className={`card ${props.className}`}>
      { props.children }
    </div>
  );
}

dashboard.js

import React from 'react';
import Card from './card';

function Dashboard (props) {
  return (
    <div>

      <Card>
        <h1>Título do card</h1>
        <p>Texto</p>
      </Card>

      <Card>
        <img src="/some/image.png"/>
        <h2>Car com imagem</h2>
      </Card>

    </div>
  );
}