Resetting the Non-Volatile memory and System Management Controller is one way to troubleshoot problems with your Mac. But the methods for resetting those have changed with the latest hardware which include T2 chips. Most users will never have to deal with these, but if you do, learn Apple's recommended method for resetting these.
If you are getting online help from a source you trust, you can help them by providing a system report generated from the third-party app EtreCheck. This report includes many details about your hardware and software that can help someone help you.