The first will print the data back as a table.   You should check this against your worksheets to make sure that what ESL reads is what you wanted it to read.   If there is any error, data might be put into the wrong place, and you know the old cliche, "garbage in, garbage out".   The second line will give you summary statistics which will come in handy when you calculate marginal effects.   The last command will give you the correlation matrix which will be useful to identify multicollinearity.