Variable special characters

Question

it says that special symbols can't be used in variable names however in the lesson "Naming Variables" it stated that The first character can be a letter, an underscore (_), or a dollar sign ($). Can someone clarify this contradiction?

Answer 1

When you go to declare a variable, you have to give a name of the variable!!
The name can be be started with a letter (a,b,c etc), you can also use $ and _ sign!! But others sign such as (#,*,@, etc) is not allowed!!
https://code.sololearn.com/Wn5P8diAj6m7/?ref=app

Remove // from 8 and 9th line to prove it!