Code Cleanup Help (Validator)

Hey Everyone-

The URL of my site is: https://www.derangeddiaries.com/

My understanding of HTML is somewhat limited, but I would like to fix all of the errors that I have on site. According to the validator, there are 6. Here is the link to the error-results:
https://validator.w3.org/check?uri=http%3A%2F%2Fwww.derangeddiaries.com&charset=%28detect+automatically%29&doctype=Inline&group=0

Would someone be willing to help me clean house a bit? I’m not asking you to do it for me, just guide me on what exactly needs to be done.

I really appreciate the help. This community is really good about aiding eachother and every time I’ve had a question you’ve all been great about answering it for me.