There is not a built in monitoring service for our webpages but I can direct you to a few very easy to use free monitoring services.
The first is a website called Visual Ping - https://visualping.io/
You can paste the address of the page you want monitored, select up to a 1-hour interval, choose "Tiny changes", and type in your email address. The website will check every hour when there is a change. When you want to stop receiving email from the site you can click the Unsubscribe link in the email. There is registration and it is free.
There are also two browser addons, one for Chrome and one for Firefox.
The Chrome addon is also from Visual Ping but it allows a per 1-minute check or even a 5-second check. There is no email notification with the addon, your browser itself will popup a window when it notices a change. You can also select the area of the page you want the addon to focus on for changes. The addon will place a little blue circle icon to the right of your address bar which you click on. You will want to select "Browser" instead of "Server" if you want the popup window, otherwise you can also use this addon like the webpage.
Please let me know if these solutions are of any help to you. There are other monitoring solutions out there but these are popular and free.