I see many useless threads with just one youtube video on them only portraying how to do one sole activity.

So, lets post all youtube video Minecraft tutorials/guides in this thread to reduce the spam.

If you have a video feel free to post it below:

Here is my favorite one, its "How to build a Portal without a diamond pickaxe".
Though it is useless once you're really into the game, but it's fun to do it this way.