This is the 435th most frequent Estonian word.
peaksid
"Peaksid" means "should" (conditional form of "must" or "have to").
This usage of 'peaksid' implies an obligation or advice directed towards the subject.
Te peaksid selle raamatu läbi lugema.
You should read through this book.
Here, 'peaksid' is used as the conditional form of the verb 'pidama', meaning 'should', indicating a suggestion or recommendation.
Sa peaksid rohkem trenni tegema.
You should exercise more.
In this sentence, 'peaksid' is used to express a hypothetical recommendation in a conditional sentence.