Restarting the application acts as an initial troubleshooting step to clear temporary glitches and is considered a best first action because it's quick and non-invasive. Reinstalling the application or updating the OS may be necessary if the problem persists, but these are more time-consuming actions that you would take if a simple restart doesn't resolve the issue. Checking the application compatibility mode is a troubleshooting step for when an application is having issues due to incompatibility with the current version of the OS, and adding more RAM is typically a solution for problems such as sluggish performance or low memory warnings.