I once heard that there is a theory that things written on yellow is more memorable. Which is why the default original color for legal pads, post-its, and highlighters is yellow.
So yellow should be what ever you need to memorize more. So it depends on your teacher and how much of the subject matter needs to be memorized. I'd say it should be history as there are a lot of dates and minute details, but I could also understand it being used for any subject that needs memorization like foreign languages, science, and even math.
Blue and green are both calming colors so those should either be reserved for that classes that give you the most stress or the classes that benefit the most from being calm, like creative writing or music.
Red is an exciting color, use it on what ever subject you are most confident i or interested in.
I guess I think the bearded guy (wait...it that a beard or just a long mustache?) Is using my system correctly.
I kinda love it in theory.
Will be trying this out.
I do find it funny however that awk is lumped together with these small use case tools like sed, grep, tr, cut, and rev, since awk can be used to replace all of these tools and is it's own language.
I don't think the emphasis should be on simplicity, but rather on understandability (which long awk commands are not either).
If you give someone a bash script, they should be able to know exactly what the code will do when they read the script without having to run it or cat out the source it might need to parse. Using ubiquitous tools that many people understand is a good step.
Sadly awk is installed by default in most distros and tools like jq and jc would require installation.