who join courses 4 such things ... they will teach u basics of photoshop n watever software is dere ... do the basic at home ... n learn 4m online tutorials ..
how many ppl i hav met who done courses r limited 2 what they hav learn dere ... graphics is a creative field .. u don't need 2 learn it ... just get inspired .. if u want 2 learn .. learn color thoery ... lights & shadows ...
but wudnt u need a qualification to work professionally as a web designer ?