FamilySearch partner, The Family History Guide, offers free lessons on genealogy research topics ranging from how to use a number of key websites such as FamilySearch, Ancestry, MyHeritage, and FindmyPast to how to do country-specific research. There are suggestions for activities, with an entire section devote to Youth projects. (See index at the top of the page.)
You can access this great resource here: https://www.thefhguide.com/index.html