Correlatives
जो...वो (The one who...that one)
Paired words — 'the one who does X, that one gets Y'. Very common pattern
Example
जो मेहनत करता है, वो सफल होता है
The one who works hard succeeds
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Related — Correlatives
जब...तब (When...then)
Paired words — 'when X happens, then Y happens'. Hindi links two halves together
जहाँ...वहाँ (Where...there)
Paired words for places — 'where X is, there Y is'
जैसा...वैसा (As...so)
Paired words for comparison — 'as you do, so you get'
जितना...उतना (The more...the more)
Paired words for amounts — 'the more X, the more Y'
जिधर...उधर (Whichever way...that way)
Paired words for direction — 'whichever way you look, that way...'