Custom settings created for apps like Mail, Safari, Messages, Facetime, Notes, Contacts, Calendar, Finder, as well as third-party app settings.

iTunes music and videos, and pictures from Photos, Photo Booth, and other apps.

Your email, contacts, and calendar appointments.

Safari caches, history, and website data.

Your user account’s HOME FOLDER stores most of your everything, including the changes you make to application settings and it also a slew of other things:

Think of your Mac user account as your information’s heart, the place your data always returns to. Use Your Mac’s Recovery Mode To Reinstall macOS or OS X.To Disable Your Mac’s SIP (System Integrity Protection).Hide and Seek: Finding the Bad Preference File.To boot in safe mode, shut down your computer.Terminal Commands Not Working in macOS Mojave+? Seeing Operation Not Permitted?.For macOS Sierra, High Sierra, Mojave, and Catalina.Be Prepared With Another Administrator Account.Changed the permissions of items in your home folder?.Enable Parental Controls on Mac user accounts.Cannot Close Photos Library? Stuck on Closing the Library Message? Fixes.macOS High Sierra Needs to Repair Your Library, How-To Fix This Error.How To Show Your User Library in macOS Mojave, High Sierra, and Sierra.Help is ALWAYS welcome here at Apple ToolBox. Try them out and let us know if something works or if you have other ideas. There are a few things we can do to fix the problem. Nothing, even Apple Products are perfect all the time. These times of crisis are reality checks. And no, I didn’t DO anything-really, I didn’t.

In my case, it turns out that my issues are indeed related to my user account.

When trouble strikes, it’s often your user account settings causing the problems. At times, I get the spinning beach ball for what seems like forever. On top of that, the computer is sluggish and not useable. Even though I can log in, none of my applications will launch. Recently, I’ve had some major problems with my Mac. What can we do to get that machine back to its beautiful normal? We think of and use our Apple Computers as if they’re stable and perfect until they fail. Sometimes our Macs behave in strange ways.

Mac os 10.12 where is user library