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We can face different situations when we [can|need to|might] know how to be safe. For instance, when we go on vacation or to the forest. We [could|would|should] think about safety when we hang around in the city. Safety is essential in crowded places. Even when we surf the Internet, safety is the first thing we [have to|would|are able to] take care of.

The Internet [should|may|must] seem like a safe place. But it can have some threats as well. You can get a virus and lose all the information from your laptop. But the Internet [can|must|should] also be dangerous for those who meet people online. These people [shall|can|have to] lie about their age and personal information. They [have to|should|may] ask for your personal data and you will never find out who they were.