No. Once you pass your test, and receive your certificate, you are certified for life. For instance if do great on your exam, and thereby get your SEO Certification, get Web Analytics Certified or a Social Media Marketing Certification, then you have it, and we will not ask you to give it back to us, or remove it from your LinkedIn profile, CV or resume. Once you pass the test, the certification is yours to keep.
What kind of commission do they offer? One-time commissions or recurring commissions? For example, many programs pay you one time for sending a customer. On the other hand, some programs like membership sites or SaaS (software as a service) programs will pay you a commission as long as the person you referred is a paying customer. Recurring commissions are great when you can find them!
Outbrain is not necessarily the network of choice, it was just an example. As for tracking the ROI usually you'll want to track campaigns in Google analytics and track clicks on affiliate links as event and average value/email or you'll want to duplicate the post and run paid traffic to the duplicate so you know exactly what the conversions are as you can put them in separate email lists etc too.
#2. Site Build It - Site Build It is my second choice for learning how to create an online business. The training is very good and you get one website with hosting included. There is no free option, which is one of the reasons that it is not my first choice. I started here back in 2007 and the education that I received was very valuable and helped me to achieve a great level of success.