Prevent apps on iPhone from triggering icons on Mac dock There's some weird linkage between my iPhone and Mac.  When I go into certain apps, it brings up an icon on my Mac.  I do not want this ever.  How can I disable this?
Go to System Preferences → General and disable ‘Allow Handoff between this Mac and your iCloud devices’.

This feature is called Handoff, part of Continuity. You can read more about it in the Apple KB:


Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch