1. Games as a source of knowledge, skills, and experience
The existence of games that can help schoolchildren and students in the study of a particular subject or topic is nothing new. Thanks to strategies from the famous Paradox Interactive many start to understand history, social studies, geography and stop being surprised when they hear "Holy Roman Empire" or "Normandy landings". The Crusader Kings, Victoria, and Hearts Of Iron series have educated more than one generation of future and current history students. Of course, even the most complex global strategies can not 100% reproduce all the nuances of historical processes, but this is not required of them.
Hardcore turn-based strategies such as Strategic Command from Fury Software, American Civil War, Birth of America, and To End All Wars from AGEod also help in the study of history. They do a pretty good job of showing the complexity of combat and deepening players' understanding of military conflicts. Even shooters like Call of Duty can work for this - with the correction, of course, that developers often sacrifice realism for spectacle.
Economic strategies, various managers, and tycoons are countless - from Cities: Skylines to Frostpunk. Isn't that a way to give students a firsthand experience of income, expenses, and opportunity costs?
Games can also help in the study of natural sciences. Spore and Plague Inc. will help in learning biology, Kerbal Space Program and Balsa Model Flight Simulator will help in physics, Heliopedia will help in ecology and astronomy.
The educational community talks a lot about interdisciplinary and meta-subject skills - in fact, everyone knows about soft skills. The ability to work with criticism, interact with teammates, plan, etc. This is where games can be useful, too.
Advising a student of a good game on a topic or using their interest in such projects is a simple and effective motivational technique. Neglecting traditional sources of information is not worth it either. Otherwise, a student growing up on Hearts of Iron might forget that Ecuadorian troops did not actually land on Madagascar in 1942.