Flip-Flop with LED Display / lamp
This project is an application of the flip-flop oscillator circuit, which we've decribed in detail elsewhere. During one half-cycle the Lamp is ON, and during the other half-cycle the LED displays a zero.
How about a little research on your own? Either from memory or by reference to other project write-ups, decribe the operation of the multivibrator flip-flop. Try to use such terms as "Transistor OFF and ON" states, "charging current" and "discharge current".
A good technician should take pride in being able to explain basic circuit actions. Have fun!