This crochet pattern by Anniina Ropponen/Vienola Crafts gives you a heart square that you can use in other projects. There is no specific hook size or yarn you should use, the size of the heart and square depends on the hook and yarn.

I sat down on the living room floor with a pen, paper, yarn, measuring tape and crochet hook. I had an idea that I wanted to try. It took me a while to figure out how to crochet a heart and then how to turn it into a square. Finally I was happy with the result. It’s great to notice how skills develop over time. First I didn’t even know how to read a crochet chart :joy: