Pre-made HTML-snippets or Forms

Hello,

I was wondering if there is a plugin where I can insert HTML-snippets in the visual view that I can use when posting or in-post forms. E.g. when I write articles I already have systemic approach, so instead of manually inserting the HTML, I want to put headings in the post that are already pre-made OR if there are forms that fill in.

Example: <div class=”heading1″>BACKGROUND</div>

If you look at this Wiki-article: https://en.wikipedia.org/wiki/Dog
Look at the headings Etymology, Taxonomy, Origin and so on

I want to make headings and sub-headings that are already formatted (CSS that I have already inserted) and that I can insert