How To use Google Classroom:
Step 1:
Create gmail account.
(If You already have gmail account Continue to Step 2)
Link: https://www.google.com/gmail/about/
Once you have a gmail account you can join the Google Classroom
Step 2:
Login to Google Classroom
Click Here to Login to Google Classroom with your gmail account or you copy paste the bellow link to your browser.
Link: https://classroom.google.com
Step 3:
Join the Class.
Once you login to Google Classroom you click the Plus sign (+) on top right and click Join Class (See image bellow)

Step 4:
Copy Paste the code which is sent to you by email
Once you join the Class you will be able to see 3 tabs (See image bellow)

Stream: All the notices, events, news about the class will be displayed in this Tab
Classwork: All the lectures, exercises and other learning material will be displayed in this Tab.
People: It will list your Instructors and your colleagues