The website audit tool checks your web pages for many different errors. Here's a list with the errors and instructions on how to correct these errors:
A broken link is a link to a web page, image or other file that does not work anymore. Broken links lower the perceived quality of your website and they are not good for your website visitors.
Server errors can have a negative influence on the rankings of your web pages. The server has trouble delivering the requested page, and that means that search engines cannot access it, either. A list of possible server errors can be found here.
A timeout error means that the web server did not respond when a page was requested. You might want to double-check if the linked page is always accessible. Search engines might not access the page. The speed of a web page is a factor in Google's ranking algorithm.
The title of a web page is a very important ranking element. The title is also used on search results pages to represent your web page. An empty title tag means that the web page won't be listed and presented as well as possible.
It's not advisable to use the same title on multiple web pages. The title of a web page should be unique and it should be related to the content of the web page.