Summary  
This chapter covers adding and configuring trendline overlays to charts, including selecting trendline types, setting forecast horizons and polynomial degrees, and styling their appearance.

General domain of usage  
Time series data analysis

**Trendlines** are great for **spotting patterns** and **predicting future trends** in your data. 

Whether you're **analyzing sales, tracking stock prices**, or **observing temperature changes**, adding a trendline to your charts can dramatically boost your analytical capabilities.



Additionally, you'll learn to change the **color**, **width**, and **style** of your trendline to ensure it stands out and effectively communicates your insights. 

## Key Points
- Use the **Add Chart Element** button to add a **trendline** to your chart;
- Format your trendline by double-clicking on it or choosing **Format Trendline**;
- Adjust the **forecast period** for your trendline;
- Set the degree of a **Polynomial** trendline;
- Change the **color**, **width**, and **style** of our trendline to make it stand out.

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Adding Trendlines to Excel Charts

Key Points

Awesome!

Adding Trendlines to Excel Charts

Key Points