Regular Expression (Regex) to NFA Conversion

Here we cover the regular expression (regex) to NFA conversion. The idea is to revisit the definition of regex, and to make an NFA for each of the 6 pieces of the definition. For the first three, we can make either a 1-state or a 2-state NFA. For the other three (the "inductive" cases), we revisit earlier constructions with NFAs using union, concatenation, and star to make an NFA for the "bigger" regex, using "smaller" NFAs that have already been built.
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▶ADDITIONAL QUESTIONS◀
1. What does the NFA for the regex ab look like?
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I am a professor of Computer Science, and am passionate about CS theory. I have taught many courses at several different universities, including several sections of undergraduate and graduate theory-level classes.