Troubleshooting computers is like a puzzle. You can see the issue of what is going on with your computer (apps keep crashing, slow computer, spinning wheel, the computer is unresponsive, etc.), but it's not as easy to narrow down what is actually causing the issue.
There are a lot of troubleshooting tools available on Mac OS that can help even a very beginner figure out what is going on. I cover how to troubleshoot on a Mac, and the work flow that I use to narrow down what is causing any issue.
This video is part of a Troubleshooting Guide for Mac, where I cover some of the best tools available on your Mac to help identify any problem.