I would recommend a trusted site like the one chess.com offers. https://www.chesskid.com/ This site is exceptional and a safer choice and incredible instruction, You get what you pay for. Spent a little and have the youth learn from high rated instruction.
group only for children and teenagers
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group only for children and teenagers who want to learn and make new friends, and improve in chess
link
https://www.chess.com/club/chess-for-children-and-teenagers