How to repair the water leakage by pressing the faucet?

What should I do if the press faucet leaks? 1. Close the water valve, remove the faucet and close the water supply gate. Unscrew the screw behind the handle with a screwdriver, and the faucet can be easily removed. 2. Remove the nut. After removing the faucet handle, you can see the internal structure. Remove the nut stuffing pliers inside, rotate the valve core or shaft in the direction of removal, and be careful not to scratch the faucet body. 3. Remove the valve core, replace the baffle, and reinstall the parts for repair.