Precautions for affiliate?

What Precautions should be taken while doing affiliate marketing?Or
Is thaere any Precautions for affiliate marketing?

The first and foremost precautions on affiliate marketing is to choose a affiliate marketing program which you feel will earn you good money and should never join any programs which looks like a scam. Never over spend on affiliate marketing promotions as sometimes you might lose all the money without any profit at all.

Thank you for your comment but I want to ask you that how to do affiliate marketing can you tell exact procedure?