How to split data into training/testing sets using sample function

I’ve just started using R and I’m not sure how to incorporate my dataset with the following sample code:

sample(x, size, replace = FALSE, prob = NULL)

I have a dataset that I need to put into a training (75%) and testing (25%) set. I’m not sure what information I’m supposed to put into the x and size? Is x the dataset file, and size how many samples I have?

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