Ralph builds huts in order to shield themselves from rainfall, similar the rainfall they experienced on the day they supposedly arrived on the island.
In addition, the huts provide phsycological comfort for the Littluns as well as some of the Biguns from the superficial "Beast".
Ralph believes they need shelter because it offers protection from the elements and can help them feel safe and secure. Having a designated shelter can also provide a sense of order and organization within the group.
Built shelter.
Actually there was no important job. Both were important but shelters was agreed more because they had edible food near them while building shelters was more important because they had a thought about ghosts and strong storms.
He thinks they shoulder make shelter.
No one else is helping them.
he finds them bulding shelter
Shelter is important because it keeps you warm, dry and safe. You shelter because you would die without it.
Ralph witnessed a shelter catching fire and felt the heat on his shoulder as flames flickered close to him. This frightening experience likely intensified his sense of urgency and danger on the island.
To make a more permanent shelter, and organize food gathering.
he doesn't, Jack does
bad
Well no a shelter is a place where you feel safe. For example, the animal shelter is to protect the animals from rain by using a roof, but it's also for the animals to feel safe and loved.