How to use Trendlines in Google Sheets

The video tutorial explains how to create and customize trendlines in charts using updated Google tools. It covers setting up a chart with data points, selecting the scatter plot option, and adding trendlines. The tutorial also demonstrates how to edit the appearance of trendlines and use them to analyze data and make predictions, using Steph Curry's basketball performance as an example.

What steps are involved in adding a trendline to a chart?

What does the speaker suggest about the trendline's appearance?