Open your Google Slides presentation and go to the slide where you want to create the timeline.

Click on "Insert" in the top menu, then select "Line" to draw a horizontal line for the timeline base.

Click "Insert" > "Shape" and choose circles or rectangles to represent key events along the timeline.

Add text boxes near each shape to describe the events with dates and details.

Customize the timeline using colors, fonts, and icons for a visually appealing design.

If needed, use animations to make each event appear sequentially during the presentation.

Review and adjust the positioning to ensure a clear and structured timeline.