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Post Edit: I've had many questions on how to hang the shelf and how to assembly. First for the hanging question, I would recommend to keyhole slot on the back of the two top pieces. You can purchase a keyhole router bit at most hardware supply store.
Second question is the assembly. A few years ago, I purchased a simple Kreg R3 jig (https://www.kregtool.com/store/c13/kreg-jigsreg/p169/kreg-jigreg-r3/). For DIY woodworkers or hobbyist, this tool is a must for you. I had never built furniture until I discovered Kreg tools.
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