What are five most useful or common Chengyu phrases in the workplace? I know there are thousands of chengyu (成语) (4 character proverbs in Chinese) out there, so obviously I would not have time to learn them all.

Could I have 5 of these chengyu from you? (bonus marks if you could explain the meaning/context).

I appreciate it!

An example of a useful Chengyu phrase is one which forms basis of everyday applications: 四通八達 (extend equally in all directions)  for example, is sort of where the 八達通 (octopus card in Hong Kong) got its name from.
a newbie


  菜鳥應該自認 才疏學淺 孤陋寡聞 有如 井底之蛙 所知有限
  對公司的文化習慣更是 一無所知 一竅不通
  縱然是 三頭六臂 神通廣大 學富五車 才高八斗
  也不可 恃才傲物 妄自尊大 目中無人 不可一世
  更不可 自命不凡 自以為是 夜郎自大 剛愎自用
  應當 虛懷若谷 謙卑自牧 移樽就教 不恥下問
  同事 循循善誘 諄諄教誨 善意提醒 好心指點
  自當 聚精會神 洗耳恭聽 聞一知十 舉一反三
  不可 漫不經心 馬耳東風 囫圇吞棗 不求甚解  
  
  做事應 按部就班 有條不紊 兢兢業業 任勞任怨
  若是想 出奇制勝 標新立異 好高騖遠 眼高手低
  常落得 班門弄斧 不自量力 布鼓雷門 貽笑大方
  真是 關公面前耍大刀 孔夫子門前賣文章
  倘若是 敷衍塞責 文過飾非 避重就輕 好逸惡勞
  終究是 水落石出 自取其辱 因小失大 得不償失  


才疏學淺 to have little talent and less learning
孤陋寡聞 ignorant and ill-informed
井底之蛙 a person with a very limited outlook and experience
一無所知 to know nothing at all
一竅不通 to be utterly ignorant of
三頭六臂 three heads and six arms; superhuman powers
神通廣大 to have great magic power
學富五車 of great erudition and scholarship
才高八斗 to have profound learning; of great talent
恃才傲物 to be inordinately proud of one's ability
妄自尊大 to be overweening; be too big for one's boots
目中無人 supercilious; to consider everyone beneath one's notice
不可一世 to be insufferably arrogant
自命不凡 to consider oneself no ordinary; self-glorification
自以為是 self-righteous; bumptious
夜郎自大 extremely arrogant
剛愎自用 headstrong; opinionated
虛懷若谷 to be very modest
謙卑自牧 to keep modest so as to cultivate one's moral character
移樽就教 (to take one's wine cup to another person's table to seek his advice) to go to somebody for advice
不恥下問 not to feel ashamed to ask and learn from one's subordinates
循循善誘 to teach with patience and skill
諄諄教誨 belecture; inculcate
聚精會神 to concentrate one's attention
洗耳恭聽 to listen with respectful attention
聞一知十 to infer the whole matter after hearing but one point
舉一反三 to draw inferences about other cases from one instance
漫不經心 heedless; unmindful; inattentive
馬耳東風 to go in one ear and out the other; to pay no attention to what one said
囫圇吞棗 (to swallow dates whole) to lap up information without digesting it
不求甚解 not to seek to understand things thoroughly
按部就班 to follow the prescribed order
有條不紊 systematically; methodically; in an orderly way
兢兢業業 cautious and conscientious
任勞任怨 to bear hardship without complaining
出奇制勝 to win victory through unexpected moves
標新立異 to do something unconventional or unorthodox
好高騖遠 to reach for what is beyond one's grasp
眼高手低 to have grandiose aims but puny abilities
班門弄斧 to display one's slight skill before an expert
不自量力 to go beyond one's depth
布鼓雷門 to take things to a place where they already abound; to make a fool of oneself by foolish display
貽笑大方 to make a laughingstock of oneself before experts
避重就輕 to avoid the important and dwell on the trivial
好逸惡勞 (love to go ease and hate to work hard) to despise labor and love ease
敷衍塞責 to perform one's duty in a perfunctory manner
文過飾非 to cover up one's mistakes
水落石出 the whole things come to obvious
自取其辱 to bring disgrace on one's own head; to ask for an insult
因小失大 to try to save a little only to lose a lot; to spoil the ship for a halfpennyworth of tar
得不償失 the gains do not make up for the losses; to be not worth the candle  

(tag line)
關公面前耍大刀 being a snob in front of a true expert; to teach one's grandmother how to suck eggs
孔夫子門前賣文章 to show off in the presence of an expert