Unless you're writing in the style of a Russian novel where you feel compelled to show the reader every footfall on every mossy stair leading to the palace (and I recommend that you don't), then you need to pick and choose what parts of the action to show and what to leave to the reader's imagination. Choose what's most important and leave out the rest.
Don't write what you an infer. But don't rush, either. Discovering this balance in your writing takes practice.
Write what's important to furthering the plot or character development. Ask yourself: How does what I'm writing now matter to the discovery of new information about my story and characters?
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