OK, the first thing I would do is change your permalinks. Permalinks are the internet addresses that your visitors see. For example, instead of the address for your Finance page looking like this:
https://www.aboutthegoodstuff.com/?page_id=250
it would look like this:
https://www.aboutthegoodstuff.com/finance
And instead of a listing of your Baking recipes looking like this:
https://www.aboutthegoodstuff.com/?cat=4
it will look like this:
https://www.aboutthegoodstuff.com/category/baking
You can change your permalink style by going to Settings → Permalinks from the admin dashboard. Day and name is probably the most commonly used setting.
OK, so from what I understand, you would like your Baking recipes to display when a visitor clicks the Baking menu item. One of the problems is that you currently have a page called Baking, so you won’t be able to list them on that page unless you want to create a special index template in your child theme. What I would do is move the contents of that page to a post called Apple Pie (since it seems to be a single recipe for Apple Pie). Then read this tutorial to create a Category Menu Item to display a list of your Baking posts:
How to create a Category Menu Item