I m doing web designing course currently.

In classes now CSS is being studied. I also posted a previous thread in this website's forum few days ago. So I should do a job immidetaly after completing the
web designing course or
further learn?My point is that for learning web development,which is better -
doing web development course or
practise at doing job?

And for this Will I have need to say to employer company that I have done only web designing course but I also intend to learn n practise in web development too?

I know its may seem stupid. But its just an idea.Coz after completing web designing course I will have a good knowledge of web designing topic. Does many students do same thing as me (I meant applying this idea which I have said in this thread?)?( I have already mentioned in my previous thread I want to be a
proffessional web designer and
web developer)