"Fuzoku, 18-year-olds, Saitama" — I figure that phrase either clicks for you instantly or it doesn't.
I'm 42 and still out there working this world in person, so I'll lay it out from a real-world point of view.
Why this topic matters
Information about fuzoku is surprisingly disorganized. Beginners especially tend to end up not even knowing where to start looking.
What that actually means
In a word: whether you know or you don't know changes the quality of the experience.
What I've written here is the essence of the knowledge I've built up over 20 years.
Last word
If you've got questions about this topic, hit me in the comments or on social. And give First Class Ruby a look while you're at it.