- to declare variables and modify them afterwards unless it's const.
-code functions and arrow-functions
-i know most useful methods for strings, numbers, arrays.
-i know how to create an object manually or from a constructor.
-i know how to create classes with constructors and prototypes
-i know how to manipulate, create or remove DOM objects.
-I know how to use event listeners
-i know how to use intervals and timeouts
-i know how to use static methods.
-i know how to use Math. methods.
-i have some experience in canvas animation.
I think this makes at least 90% of what I know.