Open the calendar or list you wish to set alerts for. If you are setting alerts for a calendar select calendar on the top task bar.
If you are setting alerts for a list choose list on the top task bar
On the ribbon, in the Share & Track section choose alert me. Then select set alert on this list.
Make sure your name is in the send alerts to section.
You can then change alert options and when to receive the alerts.
Choose OK.
You should now receive an email notifications based on the options you have selected