importante ADJECTIVE important, significant; large
Importante is one of those intriguing Spanish words that has one meaning which looks similar to English — important — and another that is a bit unexpected: large:
Tu padre es un hombre muy importante en la política. Your father is a very important man in politics.
El turismo es una parte importante de su economía. Tourism is a large part of their economy.
In its main meaning, you can choose to translate by other English synonyms, such as significant or major, according to context:
una de las obras más importantes del catálogo de Bach one of the most significant works in Bach’s output
If we want to emphasize a particular point, or prioritize it, then the phrase lo más importante can help us:
Ganar este partido es lo más importante ahora. Winning this match is the main thing right now.
Creo que es lo más importante que se puede deducir de estas elecciones. I think that’s the main thing we can conclude from these elections.
Lo más importante can also be followed by a clause introduced by que, with the verb in the indicative or the subjunctive, according to context. If you are talking about a fact that has already happened, use the indicative:
Lo más importante es que hemos conseguido los dos puntos. The main thing is that we got the two points.
In the example above we know for a fact that the two goals have been scored. However, if the manager were encouraging his team before the match, he would say:
Lo más importante es que consigamos los dos puntos. The main thing is that we get the two points.