However. What the fuck is the three eyed raven all about? I’ve always got lost with that one.
The three eyed raven was a fella called Brynden Rivers (meaning he was a bastard child from the bit in the middle of the continent called The Riverlands) and his dad was (I think) the Targaryen (the dragon family) king... but *back story interlude music* there are magical trees throughout the continent that hook up into a kind of medieval Internet, and creatures with a power called "green sight" can plug their hairy modems into that Internet.
Long story short, Brynden left his hairy modem hooked up to the Weirwood Internet so long that his bum became impaled by a tree, and he merged with said tree, and inherited a role called the Three Eyed Raven (meaning his third eye was opened... as well as his hairy brown eye)... and he handed his hairy baton over to Bran, but he has wireless bluetooth hookup and doesn't need his bum impaled on a tree to maintain his connection.
So Bran is now the Bluetooth Three Eyed Raven.