This video is long. Loonnnngggg. But I think the one things that screenwriters (and by extension, playwrights), do better than most novelists is nailing their characters and their characters’ arcs. A screenplay (or play) on average is somewhere between 90 and 180 pages. They don’t have time to mess around. An audience won’t be engaged in a movie or play if they aren’t invested in the character’s quest (even if the character is reprehensible and/or fails). This video tends to be a bit far ranging in topic but there’s some great information in there.