Respuesta a "How do I fix my Drone that won't lift off?"On a lot of these toy grade drones if you get hung in a tree and the transmitter is still throttle up you are going to burn out something. I had issues when I was new to the hobby, so I feel your pain.
Respuesta a "One rotor isn't spinning fast enough for take off"The motor or the ESC is bad. The direction that it flies to is the bad one. If a brushed motor on a toy grade quad replace the motor.