how to get home page google to behave?

I’ve jsts started building a blog at:

https://www.mycaribbeanblog.com.

I’m still in the early learning curve of how to organize the site and am using junk posts to see how things work. I’ve used the AdSense_Ready Theme because I expect the site to be at least self-supporting.

Right off I notice weird behavior by how the site handles Google Ads. The home page is showing google ads for blogging topics and hosting, etc. – but immmediately upon publishing test topics on a few specific islands (puerto rico, St. Vincent), although they are test pages – and only a few seconds old, the ads on those pages are reflecting the content of those pages.

What must I do to cause the home page to display Caribbean relevant ads? Are there pages where I can insert keywords and other metatags?