DIY PIN BOARD
First you can start off by cutting your cardboard base by length to 40cm and breath to 30cm just as show
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Just as you're done with cutting, grab a sheet of newspaper or any paper that is big enough to cover the piece of cardboard. Once you have your paper ready with you, place the paper on a flat surface and lay the card board on top.
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Now fold the paper on it side so it forms a frame on the front of the cardboard while it covers the back of the cardboard.
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Now unfold the sides and apply glue to them and stick them as how they were, midway in the process make sure to cut where the folds occur for the other sides.
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You are finally done, add on a note and you're good to go !