With the new generative A.I. powered tools it's super easy to create new music. Almost too easy, at least if you kust want something generic. Just give an idea of what you want the song to be about and short description of the style of the music and hit generate.
The result might not be what you are looking for. The results are usually fine and pass for the background music that you don't really want to pay attention. But if you really want to listen and enjoy the music you make you need to put a bit more effort to it.
Starting with the lyrics, sure self written are the best, but generated ones can also be fine if you just give enough material for the A.I. to work on. There is always the option to generate something and then adjust it to your liking.
Generating the music itself is more hit and miss. You need ro keep iterating, preferably with shorter parts like a verse or two to generate options to choose the version that best meets your vision. Repeat until you are satisfied with all parts and join them together.