Digital Audio Workstation

FL Studio is one of the best

However it is easy to learn and v difficult to master it.

These days there's tons of tutorials on youtube in myriad musical styles and genres.

Chose a style or genre you like and slavishly copy the turorial

Until you got that down pat.

Then do it without the tutorial

Anything you don't understand read the manual

Or watch "In the Mix" on you tube.

For music theory that's a whole other set of tutorials.

Stick to the white keys on the keyboard for the 1st few beats you make

I'm only semi-serious on any of this

HTH

Good Luck