Depends which Link you're on about. I'll list some general info
LoZ/AoL: Brown hair
ALttP onwards: Blonde hair
Green tunic
Has beaten Ganon 6 times
Has had 2 fairies and a talking boat
Has been engaged at least twice
Can play the Ocarina, drums, guitar and Deku Pipes
Has been to Hyrule, Termina, Holodrum, Labrynna, Subrosia and Koholint Island
Usually ends up with the Triforce of Courage
Has beaten Vaati, Onox, Veran, Twinrova, Dethl, Shadow Link and Majora's Wrath (among others)