AFTER EFFECTS SCRIPTING RESOURCES
UKRAMEDIA - Sergei Prokhnevskiy's youtube channel full of great AE tips and expressions.
NT PRODUCTIONS - Nate Lovell's youtube channel. Tutorials on scripting and extension's development.
FXPHD - High level vfx training, scripting included.
DAVID TORNO - Extensive scripting training.
BEST PLACES TO ASK QUESTIONS
CREATIVE COW - Legendary forum full of great developers.
NT PRODUCTIONS DISCORD CHANNEL - Nate Lovell's forum for questions on scripting, expressions and extensions.