Chancery italic in ninety minutes
The Renaissance hand that became our italic, reduced to four shapes and one angle.
Cancellaresca, the chancery hand of sixteenth-century Rome, is the ancestor of every italic on your screen. It is also, unusually for a calligraphic hand, learnable in an afternoon, because almost all of it is built from four shapes.
The four shapes
The first is a slightly compressed o, an oval rather than a circle, leaning about five degrees. Everything round in the hand comes from it.
The second is the branching arch of the n, which leaves the stem low, about a third up from the baseline, and curves out. Get the branch too high and you have a roman n in a hurry.
The third is the a, which is the oval with a stem. The fourth is the entry and exit stroke, the small diagonal that joins one letter to the next and gives the hand its slope and its speed.
The angle, and the only rule that matters
Nib angle around forty degrees, slope around five to ten. Then keep both constant. A page of chancery with a wandering slope looks worse than a page of a clumsier hand held steady, because the eye reads inconsistency long before it reads quality.
Why bother
Because writing the letters teaches you where an italic's weight sits, and after ninety minutes you will never again mistake a slanted roman for an italic. One is a hand. The other is a transformation matrix.