Video editing has changed a lot in the past 50 years. 'Before times', it was a physical thing unlike today's digital methods, and it would actually involve chopping up a film with a real sharp razor. They would then stitch the pieces together to create a whole movie.
While making films used to require the use of vision mixers, which were very costly devices, now we have access to high-end video editing software on our everyday computers and even our cellphones for free or at a very little cost.