Minecraft wiki entry for Complete_main_adventure, associated text: 1 Overview
2 Step 1: Building the nether portal
3 Step 2: The Nether
4 Step 3: Finding a stronghold
5 Step 4: Boss fights
5.1 Ender Dragon
5.1.1 Preparing items
5.1.2 The fight
5.1.3 Finishing off the End
5.2 Wither
5.2.1 Preparing items
5.2.2 Creating the wither
5.2.3 Fighting the wither
5.3 The Elder Guardian