Craft Eyes of Ender using Blaze Powder and Ender Pearls
Throw an Eye of Ender and follow its direction
Pick up the Eye of Ender if it drops back down
Repeat the process to locate the stronghold
Dig or explore down into the stronghold carefully
Search the stronghold for the End Portal room
Listen for silverfish spawners and watch for mossy stone bricks
Follow corridors, stairs, and hidden passages
Check every unexplored section of the stronghold
Look for a room with a lava pool and a portal frame
Activate the portal by placing Eyes of Ender in all empty frames