I’ve been playing guitar for a long time and recently bought a mandolin and what a great instrument. I’d be the fist to say that I’m an intermediate player at best as I have a entirely different definition of advanced ha.
Tab is fine for beginners but the importance of ear training is instrumental in breaking free of shackles and chains. This comes from extensive listening to where you hear the chord movement and melodies and they become visible to you just upon hearing a tune. You start to hear a 1-4-5…2-5-1…1-6-2-5 movements etc and see the melody notes
Regardless of that, if you play guitar and/or mandolin look no further. To me this is as good as it gets and if you learn this everything else is a piece of cake. If I’m looking to learn whatever genre I look towards the true masters or originators
I’m constantly listening and studying this right here. It contains everything I will ever need.