Open your Google Slides presentation and go to the slide where you want to add the video.
Click on "Insert" in the top menu and select "Video" from the dropdown.
In the pop-up window, choose "YouTube" and search for the video or paste the YouTube URL.
Click "Select" to insert the video into your slide.
Resize and position the video as needed by dragging the corners.
Use the "Format options" panel to adjust playback settings like autoplay or start time.
Preview the slide to ensure the video plays correctly during your presentation.