When you sew granny squares or other crocheted or knitted squares together, the seam looks best when it is invisible. Here's how you do it! Mattress stitch tutorial.

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Join granny squares in the last round (short video):    • Join granny squares on the last round...  
Project with joining mini granny squares in the last round:    • Multicolor Mini Granny Squares, Joine...  
How to crochet a basic granny square    • Crochet the Classic Granny Square. Be...  

My favourite crochet hook set, Clover Amour. Great shape and they make crocheting fast: https://amzn.to/45PNt7d
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