What is meant by Salesforce Premier Support ? How much does it cost ?
I am preparing for salesforce developer certification, can having premier support help me ?
There is certain developer-focussed on-line training that is ONLY available to Premier Customers (customers who pay an additional fee for Premier services including support). I believe that you need to be a Premier customer to be eligible and then they are free. You will need to get in touch with Salesforce about pricing for Premier upgrade. There are also in-person classes that you can attend, see the training section in Salesforce. The alternative is to self study. Follow the study guide issued by Salesforce to help you prepare for the Salesforce Certified Developer Exam (DEV401). Salesforce DEV401 Study Guide
Also, here is a link to Force.com Fundamentals which is very useful at getting you started. Best of luck!
I think you mean Premier Support, which has a few benefits:
If you're looking to get the developer certification, DEV401, I would suggest reading through Salesforce's published study guides. They provide links to good training resources and a breakdown of the topics on the test.
I forgot to address the cost aspect of the question. There is an additional cost, which is generally a percentage of your per-user license cost and either your entire org has premier support or it doesn't; you cannot purchase it on a per-user basis. Exact pricing should be discussed with your account executive.