I found the last of the issues as solved all the rest I think

On the about us link https://www.techiemonkey.co.uk/about-us/, the text is missing but it shows if I visit https://www.techiemonkey.co.uk/about-us/about-us/

Is it because it's the template for the nested page as I am also worried that if the client creates a new page and adds that new page to the menu, the text content won't show unless it's viewed on about-us/new-page for example

Please help as really stressed about this and need it to be working as feel I have got it all wrong and feel I am struggling with it