[QUESTION] Can I give default styling to an html tag like <p>?

You can pass all the styles you want to your initial template

const editor = grapesjs.init({
      container : '#gjs',
      components: '<div class="txt-red">Hello world!</div><p>Text</p>',
      style: '.txt-red{color: red} p {margin: 0}',
  });

Exactly what I needed, Thanks!!