I'm a parent and a software engineer, not an expert. When I want to know something about how kids learn, I go read the studies. These are my notes, with the sources, so you can read them too and decide for your own family.
40 Christmas and winter trivia questions for kids, with answers. An easier round for K–2 and a harder one for 3–5, plus tips that help it stick.
What research says about quizzing, flash cards and spaced practice for grade school kids: what holds up, what's thinner than it sounds.
Is earlier better? Does a second language make kids smarter? Can an app teach it? A parent reads the studies, including ones that cut against the hype.
A software engineer whose kids barely use screens reads the AAP guidance and the research on screen time, quality and playing together.