Videos are helpful to explain content. You have the option to create a learning video yourself or embed one from external platforms (YouTube, Vimeo, Wikimedia-Commons).
Checklist
No ads: The video must not contain ads displayed as a banner, played as a video (before the learning video starts), is included as a link to external pages or otherwise embedded (in particular; no overly intrusive self-promotion by the creator).
Free license: The video must be available under a Creative Commons license. The standard YouTube license cannot be embedded.
Serlo values: The video should not contain any discriminatory content or content harmful to young people.
Video description
The description is helpful for teachers to get a quick overview of whether the video contains the desired information or not. Try to summarize all the important aspects in a precise way.