What do the stars and labels mean beside of the emails?

Starring an email makes it important. When you star an email, this is a mental cue for you to know this is something important you need to keep. 

To star an email, go to your inbox to view all your emails. 

On the left side of each email, there are two buttons; one is a small box, the other is a star. 

Click the star.

 To view all of your starred emails, go to the left side of the screen and click the option "Starred". 

This will take you to a separate inbox where you can view all of your starred emails.

Labels help with organizing your emails.

 To make a label, go to the left side of the screen, find where it says "Labels", and click the addition sign. A new screen will open up. 

Here you will name the label you are making. 

For example, if you want to make a label for any emails you get about monthly bills or payments, you could name the label "Monthly Expenses". 

Once you have named the label, click "create". 

The label will then appear on the left side of your screen underneath the "Labels" section.

To add an email under a label, click the email you are wanting to label. 

At the top of the email, click the option beside of the three dots. 

A drop down menu will open up. 

Here you can pick the label you want to put that email under.