It's much better to have rules that we can actually live within. And absolute prohibitions, generally, are not the kind of rules that countries would live within. ↗
Write your story as it needs to be written. Write it honestly, and tell it as best you can. I'm not sure that there are any other rules. Not ones that matter. ↗
Plot, rules, nor even poetry, are not half so great beauties in tragedy or comedy as a just imitation of nature, of character, of the passions and their operations in diversified situations. ↗
I will not attempt to deny the reasonableness and necessity of a party war; but in carrying on that war all principles and rules of justice should not be departed from. ↗
If any sort of error is inexcusable, it's an incorrect phone number. One of the cardinal rules of copy editing is that every phone number published must be checked. ↗
You can read a dozen different textbooks or how-to manuals that will tell you the basic rules of what makes a story - a beginning, a middle, and an end. ↗