I’m new to Drupal and trying to create a book to be used for my site’s FAQ.
I have 2 simple questions please:
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How can you get rid of the tabs listing every single page of my book or at least reduce the number of shown tabs to 3-4, so that there is no “stack overflow” as shown in the screenshot below?

I don’t see these “tabs” anywhere in Home >> Administration >> Structure.
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In one book page I need to create a table. How could I enable tables (HTML-tables?) in book pages please?
I go to Home >> Administration >> Content >> Books and then?
Or should I go to Home >> Administration >> Structure, then Book page – edit and then?

I’m reading a lot of Drupal docs, but for some questions like these ones you just need someone in person to answer them…
Are you sure that you haven’t added them yourself?
When creating content, there is a “Provide a menu link” checkbox in the Menu settings. If that is checked, then you will get these links.
If you don’t want them, just uncheck that checkbox or remove them at admin/structure/menu/manage/main-menu