Binding is really important. Without proper binding, you cannot configure the drone's actions properly. You can bind your transmitter with at least the following things. Note that the binding process differs from the RC Receiver's model to model. The steps of the most common method is as follows:

• A binding cable
• An ESC
• A servo motor (or you can use a BLDC motor too, but it is too risky; I don't recommend it while binding the transmitter to the receiver)
• A battery

Firstly, connect the binding cable to the RC receiver on the BAT pin, as follows. In some models, the BAT pins might be known as B/VCC:

Now, take an ESC and connect the signal, 5V, and ground pin to the CH1 pins.

Connect the battery to the ESC. The ESC will make a beeping sound and the RC receiver will show an LED blinking. Now, turn on the RC transmitter after installing the battery to it. Press and hold the Bind Range Test button until the LED of the RC receiver stops blinking. Do this process again if the LED does not stop blinking. You can try switching off and on the transmitter, and then finally disconnect the binding cable from the RC receiver.

If you have successfully bound the transmitter to the receiver, you can now test your transmitter by connecting a few servo motors to the RC receiver and moving the throttle, roll pitch, or yam of the transmitter. If successfully bound, the servo will rotate, as per the rotation of the knobs or gimbal of the transmitter.