I recommend reading and developing, honestly, based on your own stylistic leanings and techniques. Clip Studio Paint does the best job with media that I've seen on pretty much any program I've used. Just take time to acclimatize yourself with the program and how it does things, which I don't think is unintuitive at all; it's different to Photoshop, but I honestly think it's far superior in every way that counts. At least, for what I use it to do, it is.
Pretty much every painter I know has a different approach. It may be best to watch speedpaints and painting videos -- and there are numerous ones out there if you take a look around -- and see what other people are doing, then try to adapt it to your own approach. That's the most effective way I've encountered, since there isn't really a step-by-step method to guarantee the same results, since every artist works fundamentally differently.
I've heard Krita is solid and seen it in action. It has some qualities I don't particularly like, but that's me -- I still recommend checking it out, since your approach may be perfectly suited to Krita. I recommend trying as many programs as you can and seeing which one works best with the way you work. Optimize your workflow that way! Too many people jump on a single program because they see a bunch of people using it, but it doesn't suit them. I've seen it for years with Photoshop, and it just holds people back to use a program that isn't built in a way to offer them what they need to make the most out of their work.
One thing that is especially relevant to my work in Clip Studio Paint and really any program that allows it: always play with the brushes. Tweak them, adjust them to suit you, learn what they do and what the things you can change actually mean and do. If you're not using something like Clip Studio Paint, where you can restore the default settings with just a click, be sure to write down the original settings, just in case.
But play with those settings! It can make a huge difference in how a program works for you.
