This question here already answers a lot of questions:
Migrating from a wordpress.com to wordpress.org blog without harming SEO
However - I guess I'm asking the same question for a generic 'other' blogging platform.
I'd likely follow the guide here: http://bijoor.me/2016/08/06/migrating-from-wordpress-to-ghost/
Does the platform differences matter - or does following the guide more or less apply?