Pick the chart from the question.

Bars start at zero, sorted biggest first, with the number on each. A pie only works for two or three parts of one whole, and even then bars read more easily.

Lines are for things in order, usually time: the slope is the story. Don’t join categories that have no order (cities, products) with a line; the slope between them means nothing.

Here the charges make a bell around ₹499, with thin tails, the impossible negatives from lesson 1 at the far left. A histogram shows the shape, the centre, the spread and the odd values in one look; a box plot shows the same more compactly when you compare groups.

Here the dots make a shapeless cloud: the table’s code draws tenure and charge independently, and a scatter shows that honestly, where a single correlation number could hide a curve or clusters. The blue dots are customers who left: 15 of the 19 in this sample had stayed three years or less.

Write the takeaway as the title, label the axes with their units, remove anything that doesn’t help (3D, heavy gridlines, rainbow colours) and use one highlight colour for the point you’re making. In interviews, explaining a chart in one clear sentence counts as much as building it.