The basic rule is: hyphenate if it comes before the noun to which it relates, open if after. So, “a quick-thinking fireman”, but “the fireman was quick thinking”. ... This ambiguity doesn't exist where the adjective is used after the noun.

Is quick thinking one or two words?

Quick-Thinking is an adjective. The adjective is the word that accompanies the noun to determine or qualify it.

Is quick and easy hyphenated?

The quick-and-easy answer is, for these and most other apparent word chains, break those chains: No hyphens are necessary — unless the phrase precedes a noun: “I rely on word-of-mouth communication”; “She made an on-the-spot assessment.” ...