In Mac, you can easily select which applications start once you turn your computer on.
For instance, you can have Mail and Safari launch automatically. This means that you don't have to open these applications manually every time you start your computer.
To do this:
Go to Apple () > System Preferences (or click System Preferences on the Dock).
Select Users & Groups and press the Login Items tab.
At the right there is a list of all the programs already opening automatically.
To add an application to the Login items, most likely you will have to go to the keylock on bottom left to male changes (also need to provide your Password).
After unlocking, press the plus sign. On the new window that opens, choose the application and press the Add button.
Repeat to all application you want to run at login.
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Comments, suggestions and questions are always welcome - firstname.lastname@example.org.