Using old Macbook as second display for new iMac.
I want to use my 2017 macbook as my second screen to my new imac, is this possible?
That won't work. The only Mac computers that could be used as an external monitor for another Mac were a limited sub-set of iMacs made between Late 2009 and Mid 2014. Tech info is here:
Use your iMac as a display with target display mode - Apple Support