(*some text*)
myFunction[x_]:=x^2;
myFunction[x_String]:=StringLength[x]^2;

myFunction[1]

myFunction[asdf]

myFunction["asdf"]

A section

A sub section

myBetterFunction[x_,y_]:=x^2+y^2;

myBetterFunction[1,1]

myBetterFunction[asdf,rtyu]