twig debug what does % mean - name of page.twig I wonder about the "%". What does that mean? 

&lt;!-- THEME DEBUG --&gt;
&lt;!-- THEME HOOK: 'page' --&gt;
&lt;!-- FILE NAME SUGGESTIONS:
  * page--node--31.html.twig
  * page--node--%.html.twig
  * page--node.html.twig
  x page.html.twig
--&gt;


And what names are possible? I need a page for a specific and custom block for viewing the whole content.
I need something like this, but do not know how to do it right.

page--node--[my-custom-block]
page--node--%.html.twig


This would be a universal template for page level views of any content type.  So if you wanted to have the same template for different content types you could use this convention.  If you need different templates for each content type you could apply:

page--node--[content type machine name].html.twig