To make a square shaped cloth, crochet as many rows high as you started with the foundation chain, ie: 30 chain to start, 30 rows high.
Use any ply yarn with suitable sized hook.
Gauge not important. 50 gm ball of yarn sufficient.
US abbreviations used.
Stitch count is, chain a multiple of 2 ch, plus 1, plus 2 for the foundation row.
I began with 30 ch, plus 1 ch, plus 2 ch, for the foundation row.
Foundation row (rs): work 2 sc in the 3rd ch from the hook, *skip next ch, work 2 sc in next ch* repeat from * to * to end working 1 sc in last ch and turn
Row 1: Ch 2, *skip next st, work 2 sc in next st, * repeat to end, work 1 sc in second ch at the end and turn
Repeat row 1 for every row worked.
Below is the cloth with a simple sc border around it.