I started the laptop and suddenly the touchpad does not respond. So none of that. Neither the right and left mouse button.
I have already tried the FN-F5 or -F6 function. Nothing. Windows 10 operator, if that is somehow important.
Have a look under the device manager and uninstall the driver from the touchpad. Then you download the latest version from the manufacturer and install it.
Restart your PC and the problem will probably be fixed.
Every laptop is different. More detailed information would be really great.
The question is something like this: How do I change the air filter in my car?