Link to Target
Make headings or subheadings for the section targets.
On the published page hover over a heading and click the link icon that appears to copy the link URL.
In a text box where your want to create the link type a word or words for your link.
Highlight the word(s).
Click the link icon (looks like a chain link)
Paste in the link you copied (CTRL-V).
Make sure Anchor Links are on: https://www.steegle.com/google-sites/how-to/copy-header-link#h.p_2_R7hNw4mCFj