Picture of Recessed  Space Saving Shelves
find the wall you want your shelves measure so you know how many boards you will need. go to your hardware store and choose your wood you will need screws  a stud finder with a wire finder if you don't have one but not required

Step 1:

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Take a stud finder and go to the wall where you want your shelves.take the stud finder and find the studs make sure there no power wires where you are cutting.now measure your space between the studs and take in account the width of your board and cut