There are no silly questions, just silly answers :)
The card Freddofrog is referring to is probably the IKO (International Kiteboarding Organization) card, which some schools/instructors hand out to their students. The idea is to ''certify'' the student's level of competence. But since there is no real ''test'' or control of quality, cards are being handed out to students who can't even self-rescue or recover their boards body dragging upwind or relaunch their kites in deep waters, etc. read more here:
www.seabreeze.com.au/forums/Kitesurfing/General/IKO-kiteboarding-card/ Dafish and Tgcp's comments are spot on. Friends teaching friends always seems like a good idea at first, but without structure and appropriate sized equipment it usually leads to accidents. So many times I have to have a chat to friends teaching friends as they are flying oversized kites with long lines on the beach in 20-25 knots + and they simply don't see the danger of it. Also, I haven't seen any of them teaching self-rescue and correct launching techniques or going over risk and conditions assessment...Nearly all those students learning from friends end up being a liability and they practice water starts at a very early stage of their progression right next to the shore, crash on other people, don't know how to use safety systems, etc. It's becoming a bigger issue every year with more and more people wanting to learn and ''save money'' on lessons.
As others said, this sport can be very dangerous and people get injured regularly, some seriously injured and some get killed...
Don't cheap out on lessons and take your time shopping for the right school and instructor who's primary goal is to teach you safety and independence. Any school or instructor who's primary goal is to put you on the board and doesn't teach to the basic safety and independence skills simply don't deserve that tittle. With the low quality of lessons many schools offer I can understand why people would ask their friends to teach them, as in many instances the quality of tuition would be similar between both.
Friends are a great asset once you complete your lessons and once you are already independent (self-rescue, board recovery, water relaunch, etc.) so they can keep you motivated and give you some tips for riding.
Good luck,
Christian