The Habitable Zone is a region of space where conditions are best for life to form as on Earth. The habitable zone outside our solar system can mean that there are extraterrestrial life.
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The habitable Zone is determined on the type of the host star. Example: If the host star is a blue giant, the habitable zone would be farther away. If the host star is a red dwarf, the habitable zone would closer up.
How do we know if a planet can support life? Astronomers use what is known as the Goldilocks condition. These are the factors used in determining : suitable temperature range, liquid water and atmosphere.
Some restrictions that may make it hard for us to find and explore exoplanets that are in the habitable zone are : Surface Gravity, Rotation Speed, Mass, Gases in the atmosphere and Surface Temperature.
Resources: https://kids.kiddle.co/Habitable_zone = Kiddle/Habitable Zone Facts for Kids