Compare different operator in lisp

• '

is syntactic sugar for quote, which takes a single expression as its “argument” and simply returns it, un-evaluated.

(quote (+ 1 2))  === '(+ 1 2)

• #'

is syntactic sugar for FUNCTION.

(function foo)  ===  #'foo

• `

a backquoted expression is similar to a quoted expression except you can “unquote” particular subexpressions by preceding them with a comma, possibly followed by an at (@) sign. Basically it’s similar with quote ', but can do more, like evaluate sub-expressions by a comma. Without an at sign, the comma causes the value of the sub-expression to be included as is. With an at sign, the value–which must be a list–is “spliced” into the enclosing list.