I use clip studio paint, its $50 for the Pro version but $219 for the ones that come with the most features.
I also used to use this free one named Krita which i recommend for beginners or people who is starting in art. Although it doesn’t have the best quality brushes and freezes sometimes.
Another drawing program that is really popular and amazing is Paint tool sai which is also $50.
And you can use photoshop but they now have a monthly subscription now which is $20 a month. However, I feel like its a waste of money since there are other art programs with the same quality that you can just pay for once.
P.s There is also a month free trail for clip studio paint, and paint too sai. so you can try out and see if you like it.