How to Make Obsidian on Minecraft

I will show you how to get lava too!

Lava
Water

So you have found a lava fall. Jump up to the source of the lava. It is where the lava flows.
Use a bucket. Tap the source while holding the bucket.

So use another bucket. Collect water. Make a big, even puddle of water.

So grab the lava bucket. Tap the water with it. Obsidian! Mine it with a diamond pick axe!