Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
The Flyblack function means that the chronograph hand can be reset to zero and immediately started again by pressing once the pusher. That’s why there are two hands for the chronograph.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.