[know one's own mind] {v. phr.} To not hesitate or vacillate; […]

[know one's place] {v. phr.} To be deferential to one's elders […]

[know one's way around] or [know one's way about] {v. phr.} […]

[know something inside out] {v. phr.} To be extremely well conversant […]

[know the ropes] See: [THE ROPES].

[know the score] See: [THE SCORE].

[know what's what] See: [KNOW SOMETHING INSIDE OUT].

[know which side one's bread is buttered on] {v. phr.} To […]

[know which way to turn] See: [NOT KNOW WHICH WAY TO […]

[know-how] {n.}, {slang} Expertise; ability to devise and construct. * /The […]