This post is an information sharing exercise as I'm aware there is heaps of talent on this site and quite often I wish I could learn and maybe even share more.
As Im sure many of you have, I taught myself photography and over the years I picked up lots of interesting pointers (recently from tpf!) to making a better picture. Perhaps one of the more obscure was to take landscapes when the Northeasterly winds blow in the U.K.,

...so as to get good air clarity?! Sounds silly but it's true.
Another good example is the rule of thirds... that is the division of an image using two imaginary horizontal lines to make "thirds" and also vertically. Keeping subjects within these guides creates an aesthetically pleasing image.
I'm interested as to what rules/laws/principles y'all know of?