What Instrument materials should I invest/get into
Alright y'all, Im starting my Instrument rating and Im wondering what reading/study materials I should get into. I know KING ground school has a course, and my instructor said that it may be good to invest into. However I was also told, and shown that PilotsCafe and Foreflight have alot of good study material too. What should I go for? Do I need to buy some big instrument study guide book? Or can I get my information from free online sources like FlightInsight on Youtube?
Any guidance is Greatly appreciated!!