Tutorial about square with number 6 and heart is below:
I work with following colors (YarnArt Jeans) and crochet hook 2.5 mm:
I use abbreviations in the video subtitles:
A – background
B - letter
Ch 19 + 1 tch, insert the hook in 2nd chain from hook and work 19 sc in row 1.
1 turning chain is at the end of each row.
Below I add schemes for squares.