The series is off to a great start.
Some people can’t see the difference between Arial and Helvetica, some get enraged when someone can’t tell them apart. And I say this from experience: I’ve replaced Helvetica with Arial and got away with it, when a client stated bluntly that Helvetica was very readable.
But as you develop this skill, it’s a joy to look at type. In a single glyph, there’s so much to be observed that seeing is an act of fruition.