My Dad passed away a few weeks ago and I now have access to his Mac computer. I have little to no knowledge of Apple devices and ecosystem, having used Windows for everything before.
I have all his passwords and Apple ID etc., and have been going through it to save photos and his meanderings. Once I have done this I would like to use it as my home computer.
My question is, can I keep my Dad's identity on there (not ready to let him go yet) and upload my own Apple ID and email accounts etc. without compromising space/usage/integrity of the machine, or will this cause me problems later if I need to get it repaired or install things later?