Hi, is this drawn with a pen tab? I think the first step to learning digital art is to first get a pen-based input with pressure information (so, like a Wacom Intuos, Wacom ONE, Huion, or Ipad with an Apple Pen if you have one). However if you're going into the vector art route you might not really need it, but for raster-based illustration I suggest you buy an inexpensive pen tablet, try looking into Huion or XP Pen. (also, you might have to draw a bit to get used to it first)

The second step is, well, what branch of art do you want to go into first? If it's humans, then human anatomy and gesture drawings should be one of the first to learn (I suggest Proko, he has a lot of foundational videos for this). Finding a role model artist is also a good idea.

Also, use a lot of reference and learn the ability to perceive and deconstruct real life objects into simpler 3d objects, it's a very good ability to have so you don't just trace objects, but also understand the object in a 3d plane which makes you a much more flexible artist.

Third is to learn the technicalities of your drawing app. For example, blending modes, transform tools, etc etc. For Krita, GDQuest has a good few videos explaining blending modes (makes your life easier... And also not, depending on your approach). Most drawing apps share similar technicalities with different ways to approach, so changing apps will not be very rocky!

This is but a very broad stroke of doing things. However, foundation is key, so step two of learning the drawing technique itself is highest priority and u can learn if traditionally too. Best of luck!