here are some resources https://viva.pressbooks.pub/openmusictheory/ this is a 100% free music theory book while not required it is recomended for understanding the basics of music chords melody rythm and harmony a list of daws this is how most modern music is made https://www.musicradar.com/news/the-best-daws-the-best-music-production-software... while most cost money there are some free alternatives like lmms https://lmms.io/lsp/
most daws also have a demo version you can mess around in to learn if you dont have samples or vsts sound fonts are a wonderful resource for instuments toby fox used them in almost all of his music
remeber that the most important part of learning music is it takes time alot of it as in years to develop your skill but always try to make music for yourself not others or it can become boring