What hardships would humans face colonizing a nearby habitable world

My story involves a groups of colonists from a near post-apocalyptic Earth settling on a nearby, newly discovered habitable world, each colony separated and unknown to the others initially. Throughout the years, these colonists populate the planet and expand their colonies eventually discovering each other. But not before they have to deal with the challenges of living on a new world.

My first question is this, in detail, Realistically, what would be the initial hardships and challenges they would face landing and settling on this uninhabited new world in the order of survival.

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What hardships would humans face colonizing a nearby habitable world

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