On the home screen, under your profile photo, you can see 5 values which your wearable registers.
When tapping on one of the values, you can see detailed information about this value. You can see when those values have been registered by a timeline at the bottom. The first value is the Steps. By tapping the target value, you can change your daily goal for this value.
In the second tab, you can see the Active Minutes. Furthermore you can see Calories Burned, Distance and Sleep (duration and quality).
By swiping to the left or right, you can look at previous days.