I don't get telemarketing calls that often, but last week there was a call from a company that tried to sell me something. I didn't know how to react, whether they were scammers or not. Then I decided to read about telemarketing in General and in particular about the company that called me. I found it on the website
wisdomfuel.com an article that explained in detail what telemarketing is, what is marketing in General, and what types of marketing there are. If you want to take courses in marketing, the article indicates which courses are the best and where to apply. Very useful and informative information.