Here is a goal: How would I find out the angle to set on solar panels that I intended to mount on a shed?

Which way makes more sense to accomplish this goal?

Choose your answer from:
a). Go online to amazon and type in what is the optimal angle for solar panels and then put in your city and state you will then need to read the articles usually the first link will provide you with the information you seek..
b). Go online to Google and type in what is the optimal angle for solar panels and then put in your city and state you will then need to read the articles usually the first link will provide you with the information you seek..
b).