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Butterick’s Practical Typography might be a good starting point http://practicaltypography.com/opentype-features.html

Ditto for Hoefler's explanation of Stylistic Sets, using Whitney as an example:

http://www.typography.com/fonts/whitney/features/whitney-sty...

As an aside I agree with the article, esp. the need for "a type interface that is consistent throughout [Adobe's] apps".

I wondered the same. Searching for OpenType and Stylistic Alternates I found the OpenType playground [1][2]. (I had to manually add a CSS @font-face rule to use a OpenType font.)

[1] http://people.mozilla.org/~jkew/feature-samples/opentype-fea... [2] https://hacks.mozilla.org/2009/10/font-control-for-designers...

ilovetypography.com is targeted at those who know a bit more about typography than the general user. Not everything can be a tutorial starting from square one.