Several components come with some presets that make more work for you. This is especially true of image and video components. Use these improvements to add default images and videos when adding these components.
Change the video that is included by default when adding a video component. Use a YouTube video code, e.g. in "https://www.youtube.com/watch?v=qgcX0y1Nzhs" you will input "qgcX0y1Nzhs".
Change the image that is included by default when adding a image component.