SLANT: The only alphabet among the 5 that are presented in my book that slants is the Italic alphabet. The other four alphabets have no slant at all; they are written straight up and down - 90° to the writing line.
Italic has a 3° - 6° slant. This can be visualized if you think of a clock showing 1 - 2 minutes after the hour. That is the correct slant.
The red lines show the slant of the letters.