Guidance for a basic responsive website

Hello, this is my first post on this forum.
I need to make a new website, a quite simple one with some pages.
It is a company website (my company) and for selling a product.
The product is a software for Windows (I mention that so you can know more or less what the site is about).

I've been reading how to make a responsive website, but I have some questions and I need some place to ask them, so here I am. I hope that I came to the right place, and if it is not, please point me where I…

Guidance for a basic responsive website