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One can find an online advertising course on the following websites: Online Advertising Course, Reed, Stanford, University, Academy Art, eConsultancy, eLearn UK, Seek Learning, to name a few.
ELearning courses have a wide variety available. Some common eLearn classes include those to advance your skills in math, different languages, history, and specialty "how to" classes. Prices also vary greatly though there are some sites that do offer free classes.