Have you tried YouTube?
Scotch game

I agree there are many resources on YouTube. I also recommend reviewing all of your scotch games and learning from them.

Watson, Watson, Watson! Get his vol. 1, and it will give you the skinny on everything 1.e4 - from there, you'll get the traps, tricks, and major variations; memorize the theory as it stands, but don't rely on it. Get a couple of model games for each major variation - just use the database to find them and pick both wins AND losses in order to see where the structure goes right and where it goes wrong.

Oh and check Watson with chessbase - sometimes his stuff is outdated and chessbase will give you the new (improved?) tries.
That's why I said that video in particular. It does skip some stuff but what's there seems a good overview.

Listen to the Five - even the St Louis chess club videos (which are head and shoulders above anything else free online) sometimes feature some dubious advice from non-GM players.....Mike Kummer teaches his beginner class that the exchange Ruy Lopez is a 'far superior' response to ...a6 than dropping the bishop back when any book will tell you that the exchange Spanish (like its cousin the Berlin Wall) often leads to a very early queen trade an an immediate endgame. Which is not to say that the exchange is 'bad', but it is to say that it is definitely NOT superior to the more popular and more dynamic Ba6.
Play through GM games - Morozevich is a poet at the board....you'll thank yourself for checking him out anyway!
Kingscrusher and Paul Georghiou video, again, is not bad. All they are doing doing is explaining theory. (You could try watching it before telling people not to watch it.) Maybe some of their opionions are wrong; you'll get that with books too. Going through GM games is not better or worse than learning opening theory; it's a completely different thing. You're not going to learn every line of the Scotch by playing through Morozevich.
Does anyone have any tips to master the Scotch opening? Like e.g. good books, movies etc? Thanks!