Check out Google's Search Engine Optimization Starter Guide. It's easy to understand, even for non-techies. I'm going to be directing my consulting clients to it (I put a link on my Resources page), as I constantly see author websites that have pages that are poorly titled and/or all have the same title. (The title is what's at the very top of your browser screen.)
For example, memoirist Jane Doe (name & book title changed to protect the guilty) currently has a home page titled, "Jane Doe, Writer." It should read, "Jane Doe, author of TOO CUTE: A Memoir."
The page with the nav bar link "About the Book" has the title "TOO CUTE." It should be, "About TOO CUTE: A Memoir by Jane Doe."
Jane's links page is titled "Links." Bad Jane! (More accurately: Bad Webmaster!) The title should be something like "Author Jane Doe: Links to My Favorite Websites."
The page labeled "About the Author" on the nav bar should be titled, "About Jane Doe, author of TOO CUTE: A Memoir."
And so on.