thanks which commandment (number) is -to love Hashem? --- why was Genesis first? blessings

Shalom, Thank you for writing back to us. The command to love Hashem appears as mitzvah number three in the list of the Rambam. Why was the book of Genesis (Berashit) put first? The simple answer is the chronologically it comes first. None the less, your question is addressed by the first Rashi on the Torah. You might want to take at look there and see what he says. (Of course I’m encouraging you here to continue your learning … :). Blessings.