The one thing that makes Minecraft epic is also the one thing that will end your digital life or your house. Or maybe both! I cant give you much more help on protecting your life besides never go outside without a sword, and wear strong armor (any armor will do though) But your house on the other-hand; that I can semi-guarantee safe.If you haven't found obsidian or don't have a diamond pickax then use this easy solution that doesn't need anything special. First you will need lots of fences. And I mean lots. Then surround your house with one layer of fence depending on how big you want your yard to be. Next if you are near hills add a second layer just to be safe so they don't jump over. This will work fine. If on the other-hand you do have the resources you can do this and make your house out of obsidian. I hope this helps. Check back next week for more help.