decision
The Italian word 'decisione' is used in the same contexts as the English word 'decision'. For example, it can be used to talk about a choice made after thinking about several possibilities, as in 'Ho preso una decisione' (I made a decision).
I have to make an important decision
This Italian phrase means someone must make something that is of great significance or consequence. In this context, it is a decision of some kind they have to make.
Your decision changed everything
In Italian, this phrase would be said to someone who has made a decision that affected, altered, or in this case, changed everything.
The decision was hard to make
This phrase in Italian is used to express that coming to a conclusion or resolution, denoted here as 'the decision', was not easy.