Creating a Google folder and sharing it's content can be confusing at first. Visit the Creating a Google Folder and Sharing Contents document for illustrated instructions on how to complete this task.
If you have uploaded a video to YouTube and you do not wish for it to be public for everyone to view, you can easily change the settings for that video. View the Change the Viewing Availability Settings in YouTube document for illustrated instructions on how to complete this task.
Visit the Docs Editors Help page for support on many Google Apps for Education tools
Visit the Google Drive Help page for support on many Google Drive questions
Visit the Google Chrome Help page for support on many Google Chrome questions
Visit the Google Chromebook Help page for support on using Google Chromebooks