How to create a level to display my unread email massages?

You can organize your emails with labels you want to
create, or existing inbox labels, like “Social” and “organizational.”
Gmail Inbox can sort your all labels into bundles or list them in the
Menu.

How to create a label

1. Sign in Gmail on your pc and open Inbox.
2. On the left corner of the inbox, click Create new.
3. Type a name for your label and click at save button.
4. Click at Close button.

Label emails
Label emails automatically

You can label your emails as you get them based on particular criteria, like who sent the email or keywords in the Google email.

1. On your pc, open Gmail Inbox.
2. On the left corner of the page, next to the label tab you want, click Settings (gear).
3. Under “Automatically add emails,” click Add button.
4. In the “From” field, click the Down arrow (button).
5. Click to choose an option.
6. Enter a name, email ID’s, or keyword. Emails that would be labeled are shown below.
7. If you need more criteria, click and and repeat steps 5 and 6 again.
8. When you have finished adding criteria, click save button.

Click to know more about - How to create your own labels?