Please recommend some worthy and exciting places where one can really value and learn about Usability principles, concepts, process and get into details of Usability, interaction design, UX design.
I'm from India and looking for a some suggestions from the experts on which is the best place to get certified in Usability to propel the skills and improve the way we do everyday things in Usability.
Since you are located in India, you could try courses and certifications from Human Factors International.(http://www.humanfactors.com)
Certifications aside, a fundamental education in the domain of human factors, HCI, etc. will certainly help.