一通百通
yī​tōng​bǎi​tōng

grasp the core and the rest follows

  1. 一 yī adverb
    [as soon as]
    Used to show that as soon as one action or situation happens, another follows immediately.
  2. 通 tōng adjectiveverb
    to understand
    to understand thoroughly; to master a subject or skill
  3. 百 bǎi numeral
    numerous
    numerous; many; all kinds of; used to describe a great variety or large quantity
  4. 通 tōng adjectiveverb
    to understand
    to understand thoroughly; to master a subject or skill