Rules??

[Bill Bob]

In all honesty, I have zero education, or people to mentor me in my life toward financial success and my money goals. I live in a world where money earned is money spent even if it is beyond means, so forgive me if I seem ignorant.

But,
What the hell is a 2% rule?
How about a 50% rule?
If they are rules, or guidelines, they are obviously counted as the norm. If this is the case, is there any other "rules" i should invest time into learning?

So far I have been very lucky as all my properties have been a respectable amount below market value in good areas where cash flow is easy. I purely attribute this to knowing neighborhoods, and not being impatient. I have never heard of these rules. As my portfolio begins to grow, I would assume my cash flow per unit should as well, so if these rules will help facilitate....

Thanks,