Minecraft wiki entry for Nether_portals, associated text: 1 First, portals are risky
1.1 Portals can accumulate Overworld mobs
2 Making a portal
2.1 Farming obsidian
2.2 Creating a portal without getting obsidian
2.2.1 A quick, simple method using a lava pool, water bucket, and some blocks
3 How portals work
3.1 Pairing portals
3.2 Zones of exclusion
3.3 2-in-1 Nether portals
3.4 Spawning a portal in the air or buried.
4 Using portals
4.1 Portals can be built-in networks
4.2 1-way long distance teleport
4.3 Non-exploit water ladder replacement
5 Videos
6 References