It’s always good to learn “the rules” because you want to understand “why” one doesn’t employ certain techniques. But once you know that, you can break any rule - as long as the end product is strong.
I’ve found one of the best and easiest ways to make a design pop is to enlarge the logo and take it down to around 8-10% transparency. That will break up the background space a little but will not interfere with any design elements at full 100% transparency (opaque). It works especially well with letterheads, posters, book covers… anything that has a good deal of negative space that could use a “bump”.
You might even find a couple of my Boxing Promotion Posters out there that use it.