Banging noise when spinning

See the next steps and use the common sense: God bless you
Level
If it is shaking and not sitting flat ( should have no rock corner to corner) check the leveling legs. Make sure to tighten up the locknut after adjusting.

Timer
Sometimes a Timer will start making noises before they fail. I would highly suggest replacing the timer as soon as the noise develops. This can cause problems with your motor and other components if left alone. This is easy to identify just listen up near the console when running.

Transmission
The transmission does not usually fail but to check this on a direct drive remove the motor and rotate the inner tub and listen for noises it should be quiet. If not the transmission is expensive and you will need to evaluate wether it is worth repairing.

Motor Coupler
On direct drive machines this is a common failure and can be very noisy. To check and replace the motor coupler watch the video.

Motor
You will need to disassemble the washer to listen to the motor running. If the motor is noisy it will need replacing. On direct drive models check the motor coupler first.

Suspension Rods
The Suspension Rods support the tub under the cabinet on some models. The washer must be disassembled to access. These usually do not fail. On direct drive types there will be springs instead of suspension rods. Either usually fails but can from being overloaded.

Drain Pump
The drain pump can be the cause of noise. On belt drive types remove the belt and rotate the pump pulley it should spin freely and make no noise. If it is noisy replace. If it does not spin freely remove and inspect for obstructions if none found replace the pump. Check the impeller on the pump it should be tight and spin freely. On direct drive types remove the pump and inspect or replace.