You cannot practice calligraphy using a computer keyboard, but you can practice typing.
How to practice typing:
1. The division of labor between each finger of typing is correct;
2. Practice more in daily computer work.
The eight basic keys of the keyboard are:
A, S, D, F (left hand)
J, K, L, ; (right hand)
Space (thumbs of both hands).
Place your fingers on these reference keys and divide the labor into typing, which can increase your typing speed.
The following are the areas responsible for each finger for reference: