Youth: You might be interesting in videos from past LCMS National Youth Gatherings.
https://www.youtube.com/results?search_query=LCMS+National+Youth+Gathering
You might be interesting in videos for past gatherings of Higher Things.
https://www.youtube.com/results?search_query=higher+things
Perhaps you would like to review the Catechism. Here are some videos.
https://www.youtube.com/channel/UCzKFLmemq0vdOEKWGKzPB3g