There are a lot of screenwriting gurus. That’s because there are so many people who want to write screenplays and are scared to death about doing it wrong. It seems that, for every 100 people who are afraid of the number of brads that must be in a script (two), the typeface that must be used (Courier 11 or 12), the right software (FINAL DRAFT for $$, CELTX for free), and every other element that they think is the key to the magic kingdom of screenwriting success, there are at least a couple gurus who have all the answers.
That’s all good, but it seems to me, from the comments I always hear from people who want to start writing screenplays, the ‘take-away’ is always wrong. The wrong “rules” are assumed to be the most important.