How To Double Crochet Straight Edges
"Having a straight edge is always very pleasing. Now, the big question is how to keep straight edges while working rows and rows of double crochet stitches. One of the most important things with crochet is to count your stitches at the end of every row. Whether you are a beginner or an expert, believe me counting your stitches is always advisable. Nothing is more frustrating than having to rip out hours and hours of work, just because it doesn't have a straight edge."
Crochet HookG/6 or 4 mm hook
Yarn Weight(4) Medium Weight/Worsted Weight and Aran (16-20 stitches to 4 inches)