Digital Marketing is a dynamic field , include many of updates every day and you have to keep updated.
Here are 6 free courses will enhance your digital knowledge:
1) E-Business:
http://bit.ly/22hMKcw
2) Social Media Marketing
http://bit.ly/1TrtIJV
3) Integrated Marketing Communications:
http://bit.ly/1RQofba
4) E-Commerce
http://bit.ly/1Wk5TFR
5) How to use Twitter:
http://bit.ly/1Tldj9q
6) Digital Marketing Planning:
http://bit.ly/1VfAtN6
Your Turn:
You have to enroll in the criteria which you want to specify on,
Implement what you learn and share your experience with your colleagues.