Q: "How many boards can one main sit on?" とはどういう意味ですか?
A: What is the context?


Q: boards と finals と exams はどう違いますか?
A: finals and boards are types of exams ...your finals are your last exams - your boards are board examinations


Q: I'm going to buy some wooden boards. But, I need to ask for a cutting service.
Can I say..
"I need somebody to cut this, please?" この表現は自然ですか?
A: That's fine! It's a bit more polite if you say "could someone please cut this for me?"
Q: "They backed away, scooped up their boards, and ran toward the dumpster with whick they had blocked the alley, none the richer, maybe wiser, but probably neither."

In the sentence above, I don't understand the part "none the richer, maybe wiser."
Could anyone clarify for me, or rephrase in other way?
Thank you.
A: It means they didn't make any money but maybe they gained experience (gained wisdom). However, the narrator doubts that they learned anything from their mistake.
Q: Even though boards of directors have the powers to rein in misbehaving founders and CEOs under Korean law, they rarely excercise their powers. この表現は自然ですか?
A: It would be "Even though the boards of directors have the power (it could be "powers", but "power" is more natural) to reign ("reign" is different to "rein") in misbehaving founders and CEOs under Korean law, they rarely exercise their powers."
Your English is very good though, it is impressive!☺️
Q: What do you call those boards that we put a mattress on?