Your timeline is where to go to see activity history, content and other notifications. It helps to imagine that your timeline is a row of cards that wraps around your head.
Swipe forward on the touchpad and the cards to the right will cycle through your display. This is a history of the notifications and actions, like pictures or messages that you've seen on Glass.
Tap the touchpad to see actions, such as share or delete, related to that card. If a card has a folded corner, tap to view and slide through a bundle of related cards.
Swipe backward on the touchpad and you'll move to the left of your timeline. The left hand side of the Home screen contains timely and location-specific information, like the weather and other cards that Glass thinks you might be interested in.
You'll also find the Settings card all the way to the left of your timeline. Tap settings and you'll be able to customise and calibrate your device. For instance, try calibrating the Head Wake Up feature. This feature will automatically turn off Glass when you take it off, and turn it on when you put Glass on again. Swipe forward until you see the Head Wake Up card. Tap the card and select calibrate
Now you should be armed with all the basic knowledge that you need to start using Glass.