I don't know how to insert an image (image of a screenshot) here

Hi Oswald.

About 1:
I can tell only How I would build it.

1. 7 pages with similar layout, each of them must be added to menu to get their alias.
2. main page layout it would be: two columns 2+10, on the left side navigation addon with links to all pages, on the right side Tabs addon with needed content inside items.
3. and on subpages you only change content of right column.

About 2 (from 2nd link):
It looks like demo layout with mix of different SPPB addons (tabs, accordion) and extra modules (newbox, revslider). Those module doesn't belong to us, so I cannot support them. Template is not ours as well. But those two addons are typical from SPPB. So in that case We can help only with SPPB.

Whole rest is in your hands (keyboard & mouse)

Just upload image on your website and share Link to it.

I think we're a little wrong. The one link I show in site is built without sp builder and use the class="table" or class="table table-striped". But I don't know how that goes in sp builder. I am completely new to sp builder.

I created two pages in the joomla editor with the result (see the links) https://www.rumani.be/index.php/layout/test-tabel

https://www.rumani.be/index.php/layout/test-tabel-striped

Can't that be achieved in sp page builder?