Wealthy Affiliate is definitely not a scam. I've been a member for a while now, and they have a lot of information on starting a business and making money online.
They offer lots of tutorials as well as a forum where there are lots of people asking and answering questions about different ways to succeed online.
I'm not sure if I can post about other websites, but if your son is looking for free info, there is a website called the Warrior Forum (warriorforum.com) that I visit every once in a while where you can learn a lot, and get your questions answered for free. I've used that to get a lot of great info, and this way he doesn't have to spend a dime.
I can't speak for the other one though, sorry. Hope that helps!
Jess