NO
When ever they want to . But some do not make webs
Spiders make unique webs because they do not want other spiders coming into their webs. They have a unique shape, design, and scent to keep other away.
yes.
orb spiders
trapdoor spiders
yes they do
spiders make webs
no, but SPIDERS spin WEBS.
If by "redback spiders" you mean the kind of widow spiders that grow in Australia, they make the same kind of three-dimensional tangled filament webs that all the member of their Family make. Some other kinds of spiders make orb webs, sheet webs, etc.
Yes
Yes.Because why can it move and why can it make sider webs?
Well spiders that make webs only make the webs so that they can catch food; I'm presuming by 'hunting spiders' you mean spiders that kill in limb to limb action and/or biting/venom - these spiders kill stuff themselves and so don't need a web to survive... Survival of the fittest and shiz! Yeah that's just my opinion, but technically all spiders are hunters since they eat other animals ;)