Stumbled across this at Aerogramme’s Writers’ Studio, and even though it was posted in 2013, it’s still full of good advice for screenwriters. Have at it and learn from a master!
My Favorite Tip from this List: Everybody Has A Reason To Live. It’s always nice to be reminded that your main character isn’t the only one with a goal and a plan to succeed. Keep this one in mind and you won’t write any two dimensional characters.
What Seems Dated from This List: Cut What You Love. Really? I know this is a version of Kill Your Darlings, but I’m not a fan of that one, either. Sure, it’s important to know as a writer that sometimes you have cut out a scene you love, but to make this a thing that you need to do all the time is ridiculous. Cut all the things you love and you’ll have a soulless script. See Joss’s #3 and skip this one, especially if you’ve honed your screenwriting skills.