I just recently installed Krita onto my Window 10 PC. The program is smooth, but I was able to use it. When I created a canvas and chose the brush, as soon as the brush entered the canvas, it froze. Although I could not see the pen, I tried to press onto the frozen screen and move it around, after 3 seconds, there are scribbles that I made appeared in a glitch lagging forms. I think my computer might be missing some kind of graphic device that supports Krita, but I'm not sure what it is. Please give me some help.

Very likely, the graphics drivers of your intel integrated graphics card(yes, you have one) needs updating.

Check this link for more info: https://docs.krita.org/KritaFAQ#Krita_s ... _Intel_GPU

Or go to the intel website to search for drivers.