Creating an Announcement in Google Classroom

Announcements are a way for the teacher to pass on important information to the students. On the Stream tab, click on the box below the class banner that says "Share something with your class...". If you have multiple classes, you can choose which classes to post the announcement to. This is useful if you have multiple sections of the same class. You can choose which students will see the announcement (all of them, or individual students). You can add attachments, such as a Google Drive document, a link to a website, a file from your computer, or a YouTube video, by clicking on the "Add" button on the bottom left. (For more information on adding attachments, see the attached in-depth PDF.) 

Once you have typed your announcement, you can post it by clicking the "Post" button, or click on the arrow to the right of the button to schedule the announcement to be sent out at a certain time, or to save it as a draft.