If it's pretty small, it could just be a house spider, which are harmless, but if it about the size of a quarter, it could be a brown recluse, whose venom rots flesh. So careful.
The spider with a big brown ball on its back is likely a species of orb-weaver spider.
the pupu spider
A spider with a brown oval mark on its back could potentially be a brown widow spider. Brown widows are related to black widows but have characteristic brown markings on their abdomens. It's always best to consult with an expert or use caution when identifying spiders to avoid potential harm.
The worst kind.
a tarantula!
One that is walking backwards
An Arrowhead spider is brown with a green back. This spider is also known as a Triangle Orb Weaver. This spider is not venomous.
it is black light brown and hair............
i think it would b a tarantula
that is either a jumping spider rarely found,but common in mohave desert and in other many deserts (their feather like skins blandes them with the surroundings)
Brown Widow. It is not as bad as Black Widow, but it still isnt good.
Not enough information to answer this question without knwing location of spider and season.