A Pokestop that I did not create, the physically building has moved to a different location. It is not too far from the original location, but it is a noticeable distance. I was wondering if the Pokestop could me updated and moved to the new location or if I would need to create a new one for it? I could not find any information on this particular topic.
Similarly related to this, a few Pokestops I have seen, have changed hands(for example restaurant changed owners/names, school moved&location turned into a bank), was wondering how to get these SPokestops fixed as well.
If a Wayspot, which is what the locations are called, has moved more than 10 m but is still the same, you can request a location edit via help chat on the Wayfarer website. You will want to look for the orange chat bubble in the bottom right of the screen.
However, if a business Wayspot has changed what it is, such as a restaurant changing names/types of food served, these will need to be removed first. Any change in what the Wayspot is being used for would require removal of the current Wayspot first, then once removed, the current POI can be nominated.
Keep in mind that not all businesses are eligible to be Wayspots, such as banks, as these are seen as generic businesses that can be found almost anywhere in the world. Do make sure to follow Wayspot Criteria when nominating, and more clarification can be found in the Criteria Clarification Collection, too.