PDF with step by step instructions and lots of pictures. It is in English and uses standard US terminology.

This pattern can be worked with any yarn and hook size.

You can stop after row 1 for just a cute little heart without the square.

Materials required:
hook in any size
yarn in size suitable for your hook
scissors to cut yarn
tapestry needle to weave in ends
stitch markers (4) if needed

Skills needed:
Knowledge how to chain, slip stitch and single, half double, double, treble, and double-treble crochet

You can use any sized hook and yarn for this pattern.
A 3mm hook and fine yarn, the square measured 11x11cm.