There are many Crash Course videos from PBS Digital Studios, starting with one that builds on the Screenwriting Resources posts here at mediateacher.net: Screenplays. It reviews the standard basic “rules” seen in screenwriting manuals, although you will of course want to turn soon to Chapter 7 of Moving Images to dig in well and be inspired about the possibilities and standards in writing for moviemaking.
There are also pieces on the invention of the movie camera, sound, independent cinema, many on film history, and numerous others.
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