It's not too terribly difficult to make fonts. I've done it a few times. Making good fonts gets a little trickier. Beyond having good font creation software, to really design high quality fonts, especially those that are for more than typing short decorative headlines on personal projects, you need to be able to do more than just scan in your handwriting or doodling and spit out a TTF file.
Learning typeface anatomy is one key to good font design. The shape and size of various strokes, counters, and serifs give a font its personality and style. Understanding how these bits and pieces fit together, where uniformity is desirable, and where some quirkiness is acceptable, can make you a better font designer. And if you want to market your fonts, knowledge of type history, typeface classifications, and typeface design standards become more than just "nice to know" type trivia.
Related categories: Font Design | Type Designers | Practical Typography Tutorials
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Graphics by J. Bear