For this one you will need ALOT of cobblestone, so you might need to use the "Mining [Starting]" chapter, or an infinite cobblestone generator. When you start taking in decorations as one of your hobbies, use cobblestone walls as a modern/basic/secure ways to keep mobs away. A nice trick I use is to add String on top of the wall, two strings on, leave a gap, then add two more.
Not only is it a REALY nice design to me personally, but Spiders see String as a semi-transparent block, so they can't climb over it.
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Minecraft Techniques
RandomA simple book of tips and tricks to take advantage of your Minecraft world... All chapters are labeled beginners [hand pointing] and experts [peace sign] I only have the xbox360 edition, thus my only way to play and experiment. Cover by: @troks252