Suggest me some course

Don't bother. Videos courses aren't that good - in fact they are generally total rubbish, and digging out a good one from the dross is well nigh impossible.

Instead, go on a course (a human get explain things in different ways until you get it) or buy a book (Addison Wesley, Wrox, and MS Press all do good ones) and follow it cover to cover doing all the exercises.