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It is very important to always communicate with children and provide good or positive and useful things according to their age, and to be supervised when children play with cellphones or other devices and check them.
At present many gambling sites do not have a good level of security and there are many other sites that can damage and affect their mind which should not be done because they are not old enough, and still pay attention to their associations because children's minds are still very impressionable and have curiosity and try .
But we don't have to force them to communicate because we need to give them space to have their privacy, especially when our kids are a teenager. But we always supervised them, even if they don't know that, so if something happens to them, and they need to say something, we always beside them.
If they still kids, we can apply a strict mode in their mobile phone, so when they click links on their phone, the links will not redirect to the destination website. That can prevent them from visiting on a strange website, including preventing them from knowing gambling or porn. Supervised kids will need a big effort because their minds still like a white paper, which is clean.