Learning java script

Hello everyone!
this is an example of how an internet explorer works after putting in the java script memntioned below
I just want to learn it and how and what course in computers i should do?
javascript:function flood(n) {if (self.moveBy) {for (i = 35; i > 0;i--) {for (j = n; j > 0; j--) {self.moveBy(1,i);self.moveBy(i,0);self.moveBy(0,-i);self.moveBy(-i,0); } } }} flood(6);{ var inp = " ....hselmak.... syadiloH eht yojnE ,iH"; var outp = ""; for (i = 0; i <= inp.length; i++) { outp = inp.charAt (i) + outp ; } alert(outp) ;}; reverse