Create a chart
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Select data for the chart.
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Select Insert > Recommended Charts.
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Select a chart on the Recommended Charts tab, to preview the chart.
Note: You can select the data you want in the chart and press ALT + F1 to create a chart immediately, but it might not be the best chart for the data. If you don’t see a chart you like, select the All Charts tab to see all chart types.
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Select a chart.
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Select OK.
Add a trendline
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Select a chart.
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Select Design > Add Chart Element.
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Select Trendline and then select the type of trendline you want, such as Linear, Exponential, Linear Forecast, or Moving Average.
Source: Microsoft