Reinforcing common mistakes e.g. with .remove() later in course

I recently ran into trouble with `.remove()` and wasn't understanding why the list was returning `None.` Turns out, futurecoder had taught me correctly, but I simply forgot.


In futurecoder (and other code courses in different languages), there are often quick lessons that highlight common mistakes and nuance, but it's hard to remember them outside of the single lesson. Usually a lesson is reinforced immediately with an exercise, when a learner is unlikely to be tripped up by the nuance that they're actively thinking about.

Suggestion for improvement: Reintroduce common mistakes/nuance later in the course, when learners are likely to have forgotten that particular lesson. I learn better from my mistakes! That might be true for others, too.