What is the reason for difficulty in shifting gears when the manual transmission car is cold and smooth shifting after warming up?

[MacCora]

Manual transmission cars experience difficulty in shifting gears when cold and smooth shifting after warming up due to insufficient clutch release travel, resulting in incomplete clutch disengagement and inability to engage gears. The steps to start a manual transmission car are: 1. Sit properly in the car; 2. Start the car; 3. Press the clutch; 4. Engage 1st gear; 5. Slowly release the clutch; 6. Gently press the accelerator; 7. Fully release the clutch, completing the car's start. The correct method for shifting gears in a manual transmission is: 1. Observe the car's RPM before shifting, shifting when the RPM is between 2000 and 2500 to avoid sluggish acceleration, jerking, or unresponsive throttle after shifting; 2. Press the clutch all the way down while releasing the accelerator, then move the gear lever to the corresponding gear; 3. After completing the gear shift, lift the clutch to the semi-engaged state, wait for the car's power output and transmission to connect smoothly, gently press the accelerator to give fuel, and then slowly release the clutch.