Once the engine has started and warmed up, you can begin to ride. This is done by shifting down into 1st gear and letting the clutch lever out while simultaneously pulling back on the throttle.  Make sure your kickstand isn’t out. Slowly let out the clutch lever until the bike starts to roll forward. You may have to pull back on the throttle slightly to prevent your bike from stalling while releasing the clutch. Once you are moving, accelerate slightly and pull you feet up onto the pegs. Try straight line riding. As you let the clutch out and slowly roll the throttle back to pick up a little speed, continue riding in a straight line. When you are ready to stop, pull in the clutch lever, and slowly apply the front and rear brakes simultaneously. Use your left foot to steady the bike at a stop. When you are stopped, put your right foot on the ground. Once you’re able to start riding in a straight line, get a feel for shifting. Get a feel for the "friction zone". The friction zone is the area of resistance created as the clutch becomes engaged. This area allows for the transfer of power from the engine to the rear wheel. Motorcycle transmissions are sequential, meaning that you have to shift one gear in a consecutive order, whether shifting up or down. It will take some practice to be able to feel and hear when it's time to shift. The engine will start revving at higher rpms when it's time to shift.  With your bike on, shift all the way down into 1st gear. You’ll know you’re in 1st gear when the shift pedal doesn’t click down anymore. You should hear a bit of a clicking noise when in 1st. Very slowly let your clutch out until the bike starts moving forward. When you want to start moving faster, pull back on the throttle slightly as you let out the clutch. To get to 2nd gear, pull the clutch back, ease off the gas, and pull up firmly on your shifter to move through neutral. Check to make sure your neutral light is not on. Let the clutch out and engage the throttle again. Repeat this process to shift through...

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Write a summary of the previous text in Vietnamese:
Bắt đầu vận hành xe. Thực hành cách sang số. Thực hành quay đầu xe. Thực hành giảm tốc và dừng lại.