As promised here it is my Patreon post which reunites some useful guides and fixes for beginnners and experts on Source Filmmaker alike. All free of charge and available to the public.
Be warned: SFM is a touchy piece of software which despite providing a frustrating experience sometimes the rewards you can get once you master it and have enough patience to deal with it are great, just like playing a Souls-like or fighting game. Practice makes perfect.
I'd like to credit and thank all the people who I linked in my post. You're all great!
