If you are in the computer repair business you have to know this forum

 The IT Knowledge Exchange

http://itknowledgeexchange.techtarget.com/

 

 

I use this : Learn Online Marketing Fast

You probably read the story of John Crestani, http://finance.yahoo.com/news/how-a-28-year-old-got-fired-then-built-a--666k-a-month-business-while-travelling-the-world-005449876.html, a young guy who barely works a few hours a week and still manages to earn tons of money. The key words to his success were online marketing. And if you would like to copy his success formula or are simply interested in online marketing, I just found what you need :

A quick course on online marketing. I haven't read the contents yet, but it looks like it's an efficient way to learn this subject's fundamentals.

fundamentals https://www.quicksprout.com/the-beginners-guide-to-online-marketing/

Genius web annotator-- no installation required and free

This web annotator will let you highlight and share articles from any  website. It's free and if you don't want to, you don't have to install anything. All you have to do is  genius.it/ in front of any URL to annotate and read other Genius annotations on any page on the Internet.

Their website is : http://genius.com/web-annotator