It should be, for example, 'focus on the big idea' : idea is a countable singular noun, so it needs an article.
It means you should concentrate on the most important concept or message rather than wasting time on minor details.
9 maart 2015
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If I'm right, it means to pay attention to what is important, and not to get distracted by details.
9 maart 2015
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!