To do this discussion, one needs to understand the things on https://
Talk to your children about the cost of video game purchases. Video games can be expensive and many also offer opportunities to make additional in-game purchases that can really add up. Be aware of monthly subscription fees. Discuss reasonable limits on spending and agree on a specific amount that you are both comfortable with.
Thinking of getting a new game? You should watch some video of the actual game play before you purchase it. Make sure the graphics and game play will be a good match for you. Do not go to the official YouTube release video by the vendor. Search for independent videos that are made by users.