What software can teach you how to write music in musical notes?

hello, i have been wondering, with today's software library including how-to lessons on a variety of subjects, if there is a software title that would teach you to write musical notes of your songs or even translate them into musical notes to be printed in paper. I would really appreciate it if someone who knows exactly what I'm talking about would give me some links to this software, especially if it's for free. R.S.V.P.What software can teach you how to write music in musical notes?youtube is your friend