It is never too late to learn.
My iPad and iPod couldn't connect with the Wifi had been a long time. (may be more than 1month). At first I thought it was my iDevice's problem because my family's MAC's couldn't connect with the wifi either later. I began to distrust Apple's device. We thought it was very strange that all the Apple devices had problems. Finally, we asked Comcast(our net work company) for help. Luckily, it was wifi's problem and I don't need to use my phone as Wifi spot anymore now.
What a great day it is!