First of all, please allow me to say something that you may not like to hear: First of all, the songs written by people who have no musical foundation are not pleasant to listen to, because you don't know the knowledge of music theory, and the songs are not processed, but made by synthesizers. Writing and publishing songs is a very complicated matter. I suggest you learn some knowledge of music theory first. The left hand from thumb to thumb is 5432 1, and the right hand from thumb to little finger is 12345.