My Projects
By clicking on My Projects on the left-hand side navigation, you can create a project for your website.
Site Audits and Email Updates
You will be able to do a Site Audit for your website and find out the health of your website, discover any broken links, and other errors and relevant data. You will be able to sign up for email alerts given you updates on your site's health.
The email will look something like this:
I know I have some work to do on my website. You will discover that the larger your website gets, the more maintenance and upkeep there is to do and the more errors that will need to be addressed.
Limitations
The toolbar is limiting, because SemRush does want your money and will pressure you to "upgrade". The toolbar will only allow you to see some much information and you will limited by how many views you get to have. You will no doubt be asked to upgrade here and there. That being said, there is some nice information which can be had from utilizing this free toolbar. To get around the limited number of views, you may be able to uninstall and re-install the toolbar. I am not sure if that will work, but you can play around with it.