Basic rule to good copywriting for product or service

There is a basic set of questions that need an answer when doing copy write for corporate, product or service website. You follow them, keep "no bullshit" sign in front of your eyes all the time, and you will do one hell of a copywriting.

To keep it simple, it goes down to answering the following:

1. Who we are

2. What we do

3. How we do it

4. Who we do it for

There isn't a single corporate / product / service website on the planet that needs different approach than this, when it comes to copywriting and producing short and meaningful content. 

I could water down this in 10 more paragraphs, but... who wants to understand, this will just suffice. Other won't understand anyway, so... there you go.