How is the order determined on the home page?

I’m trying out your theme and so far, so good. I like what I’m seeing, EXCEPT the fact that it’s showing an old post from 2015 as the first post on the home page. I only want it to show the latest posts but I can’t figure out where the setting is for this.

Additional I’ve told it to show at least 9 posts for the home page but it’s showing 10 – how do I make sure it only shows the number I want?

I think most everything else I’ve been able to sort out. Looking forward to hearing from you.

Thank you.