This section is mostly about doing stuff in new Google Sites. Should still have links to old google sites, but they will be deprecated soon so, gotta learn the new stuff.
To add a sub page select on page on right, click ..., click add sub page.
To add a Link add a text box, select the text you want to be an HREF and then click the insert link symbol.
We can add an Image but it refuses to auto size based on width of page. We can specify fixed size, but that sucks. Also no auto click to drill into image itself. Way better on Classic Sites.
Best we can do is move width right, then click uncrop to keep ratio.
Add Sub Page stops working after 5 sub levels. There is NO way around this.