This is a no brainer and one of the easiest things you can do to help a site perform better in search - make sure their title tags are reflecting the content on the page and what the searcher would query to find their content. John Mueller from Google said on Reddit "good titles & descriptions are some of the easiest wins you can get on webpages."
Good titles & descriptions are some of the easiest wins you can get on webpages. We did a round of site-reviews for some NPOs recently, and the number one item that came up for almost all of them was that what they cared about wasn't front & center on their pages, and reflected in their meta-data. How are search engines supposed to guess what you want your pages to rank for?
It is often the most obvious thing for us in the business, which is the least obvious for those who are not in the business.
So make sure your titles and description are descriptive of the content on the page and how your users will search for it.
This is really basic stuff but sometimes going back to the basics is refreshing.
Forum discussion at Reddit .