Hi Niladri,
What is course duration? Is it, for example 5 days course?
By creating courses you can say start from beginning of the week or any day you would and you can set to / not to plan on holidays. It's like a mass planning.
For example if you have 5 days courses system will create each week a course and if there is any holiday in any day during a week, system will throw it out.
Regards, Omid