Which ICT (Price Action) Concepts to Learn?

Hey yall,

Currently a funded trader but have been wanting to delve into ICT concepts. I see them more as just repackaged price action concepts but there's some youtubers I like who explain ICT concepts pretty straightforward.

My question would be, those who do trade ICT concepts, which would rank to be the easiest to learn, and which were the most effective after implementing them into your own strategies? I know the concepts kinda build off each other and work together (again, more price action concepts more than anything) so wanted to see which would be a good starting point?

Thanks