Once you have finished your first font, you may want to make an italic or bold companion for it, especially if it is an upright-style font intended for use in text sizes.
Sometimes font designers may slant upright fonts instead of drawing italics. We don't recommend this. Any layout program can slant a roman — graphic designers don’t need an extra font for that. What makes an italic usable and interesting is a different design — radically different in some cases, or subtly adapted to the function and angle in others.
Similarly, don’t just add weight linearly when making a Bold. This will often destroy the contrast and make your font look heavy-handed, with too dark joins and too small counters.
The same goes for other variations, such as outlined or shadowed fonts: Don’t rely on automatic effects. Rather let your eye guide you.
Finally, when creating intermediary weights using interpolation — first study techniques for proper point placement on your extreme weights AND double check every single glyph in every single font. Sometimes strange deformations occur when interpolating. It is crucial to thoroughly check your results and amend where necessary.