What is the difference between a full frame and cropped sensor camera?

and when does it come in handy? Looking to get rid of my sony a6000 for a DSLR. And do you trust sites like ebay? To purchase cameras from?
Added (1). thank you:)

Read more: What is the difference between a full frame and cropped sensor camera?

What editing software does the Nikon D3300 come with and is it aby good?

So I purchased the Nikon D3300 and it will arive tomorrow so I was wondering if I need to buy a better editing software than what the camera comes with. And do you think I need a better editing software

Read more: What editing software does the Nikon D3300 come with and is it aby good?