I would like to build a simple web site made of 3 simple pages with a background slideshow of 5-10 photos.
I have no idea where to start from.
Can anyone please give me an indications?
You will probably want to drop a navigation bloc in the global area at the top, which is then replicated on all pages. Then add a carousel bloc below that in the main area and add images.
You could do a lot worse than watching this free starter guide of videos to get a feel for the basics, but what you want to do is essentially straightforward. https://store.eldargezalov.com/getting-started-with-blocs