Very close to buying a 14" MacBook Pro!  If I do, I want to clear out and transfer my 2015 MacBook Air to my granddaughter.  I believe I understand clearing the drive.  But my questions have to do with what to do after that.  Granddaughter has a iPhone, therefore believe she must have an Apple ID.  How do we get the fundamental programs/apps (Pages, Numbers, Calendar, Messages, Photos, etc.) back on line and in her name?  Is that something I do before I give it to her or something she does once she does whatever it is she needs to do contacting Apple?  Is there a tutorial on this subject somewhere?  Thanks for help and suggestions!!