Categories and Links Not Working

Hello World,

I am having difficulty with my blog. I have put several posts into the blog and organized them into categories. When I click on the category every blog posting comes up. It is the same when I click on the page link for Christmas Letter 2008 which I set up as a page (only the blog posts come up). My site is https://www.patrickholidayletter.com. Any help would be appreciated.