What’s the ideal procedure to have an image thumbnail?
I was thinking of linking an image from the post and put it inside a div or something, or is there another, easier way?
My posts gallery is a grid of boxes, so I would like to have those boxes display an image representing that post.
Should be fairly straightforward, you can use as an example this pen: https://codepen.io/ptsurbeleu/pen/VyEWZb.
Also if you need figure out a grid thing, look at Bootstrap, they have very friendly & usable examples of that: http://getbootstrap.com/docs/4.0/layout/grid/
On top of that, Bootstrap features Card element that you can use for the very same purpose, here: http://getbootstrap.com/docs/4.0/components/card/.
Hope that helps!
Thank you! Works great!
My pleasure, enjoy! 
