• no variable but symbol:
• dynamic scope/Lexical Scope(only in let & lambda & declare) (in EmacsLisp script, this might be disabled, ref https://www.gnu.org/software/emacs/manual/html_node/elisp/Selecting-Lisp-Dialect.html#index-lexical_002dbinding)
• (defun …) (func arg1 arg2 …)

types

xxp → predict if var is xx type

type-of → symbol of type

syntax

routines

control flow

predefined macros