Please no spoilers! I wanted to know if mine craft tells you how to make a portal within the game?

I've know there's a lot of videos and people with hints on how to make a portal but I Don't want to watch them since I want to figure this out by myself. Within the game itself is there a hint on how to make a portal cause I have been playing forever now and I want to go to nether, and I know I need a portal. I'm hoping that I will find a clue am I hoping in vain? Minecraft mentions nether but so far I haven't found any instructions, just curious if any one can suggest something without saying to much.