On which network did 'Saturday Night Live' originally air?

On which network did 'Welcome Back, Kotter' originally air? In what year did 'Welcome Back, Kotter' premiere? Where is 'Welcome Back, Kotter' set? Who created 'Welcome Back, Kotter'? In what year did 'Saturday Night Live' premiere? Where is 'Saturday Night Live' set? In what year did 'Wheel of Fortune' premiere? Who created 'Wheel of Fortune'?