Best practices for structuring content

I was wondering whats the best way of structuring content inside a post.

Basically, all my posts are going to be the same, which include:

An image (always the same size and position)
A description
An author name
A gallery name

Obviously the slack way is just to add the image to the editor, and write out each of these items below it in the “write post” editor, but I wondered if there was a more structured way, since each post will have the same data “fields”.

I want to make it future proof, in case I change the theme or layout later.

Should I wrap each element in a class, or is there a plugin or something that can help with standardising the way you enter posts like this?

Thanks