There are two ways to create a link which would lead to a certain block (section) within the page:
1. Any block can be targeted with a special link: Just add "#rec129000" to the URL. Every block has a unique number like that. It can be found in the Block Settings panel
(bottom of the screen).
2. Add a special block called Anchor (available at the Block Library > Other > Anchor Link). This block will require an anchor name. For instance, "chapter1". This one could be targeted with the URL "#chapter1". The block itself would remain invisible.
3. You can also target a block on a different page. The link would look as /page3232.html#rec334434