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Even though Mac OS X Lion is extremely reliable and well matched to the Macintosh computer hardware on which it runs, it is likely that you will encounter some type of problem at some point. In most cases, a few simple steps will correct a problem. In others, you might need to run a utility application to solve a problem. In the most severe cases (which aren’t likely to happen because you use a Mac), you might need to restore your Mac from a backup or reinstall Mac OS X.
The most important part of troubleshooting and solving a problem is to remain calm, which is easier said than done (is anything not easier said than done?). Problems seem to happen when you can least afford them, such as when you are neck-deep in a project, and that can lead to frustration. Frustration can lead to inefficient troubleshooting and result in taking actions that actually make the problem worse.