Is it "hand job" or "handjob"?

hyphen and comma

In that example, it should have been first-hand or firsthand. When multiple words are used together as an adjective, in this case an adjective-noun pair, those two should become hyphenated. I just wrote another example -- it's 'adjective-noun' because the two words are used as an adjective for pair, even though they would not ordinarily be hyphenated.

For the same reason, asking "is it 'first hand' or 'first-hand'" would be meaningless, because it depends on the context, unless a stylistic choice is made to write 'firsthand' instead

That's a Hugh Jass car.

Was it from uncle Jack and his horse?

It's the only job opportunity the clankers haven't taken from us yet.

registers for school that does mentoring

I remember my first handjob mentoring day. They sent out a blast email for all the students to bring their own lube and I remember Jackie brought in a quart of Valvoline motor oil. 🤣

Name: John Doe Age: 36 Sex: No experience, sir

Oxford commas, people.

Also hyphens will work.