jIMOh
Thinks s/he gets paid by the post
I'm not sure about the best, but I used Indeed to assist my son with his first job a few years ago. A friend of mine used Snag-A-Job. If he has some idea of companies he'd consider, he could go directly to their websites.
Don't discount job fairs. My son got a better job last year through a job fair at our local mall. It was sponsored by Goodwill. Their website might list some upcoming job fairs.
Best sites I find
1) linked in
2) indeed
3) glass door
4) all the other (ladders, monster, career builder). Collecting unemployment will likely require a less than optimum job board.
Linked in allows searches by area, job title and subject which I find easy to set up, and it tells me if any of the 2000+ people I know work there.