Here is a free tutorial on how to make a simple crocheted heart...
I have used 10 crochet cotton and 2.50 hook for this sample.
Row 1. 13 ch., work 1tr. in 7th ch. from hook, 2ch., miss 2ch., 1tr. in next ch., 2ch., miss 2ch., 1tr. in last ch.
Row 2. 5ch., turn, 1tr., in next tr., 2ch., 1tr. in next tr., 2ch., miss 2ch., 1tr. in 3rd ch. of 5ch., at en
Row 5. turn, work 10dbtr. into 4ch. loop, 1dc. into 3rd dc. on last row, 10dbtr. into 4ch. loop, ss. to join in last dc. work 3dc. into square, 3dc. in next square, 7dc. into bottom square, 3dc. into next square., 3dc. in last square, 2dc. in between each dbtr., to dc. in the middle, ss. to join in dc., 16ch., ss. to join in same dc., 2dc. in between each dbtr., ss. to join in 1st dc. Fasten off
ch. = chain
dc. = double crochet
dbtr. = double treble
ss. = slip stitch
st. = stitches
tr. = treble