Spiders scare me. But I do like Huntsman Spiders because they kill cockroaches. What kind of spiders do you hate or like? 
Tarantulas! they are an invertebrate that relies on an exoskeleton for muscular support
I've seen those in pet stores.  Do you have a pet Tarantula? 
I know that for the most part they arent dangerous to humans, and some are popular in the pet trade but i am deathly afriad of them
Oh, I guess you never had one then. I think they are ok but they don't have much utility. 
just a regular air-breathing arthropod that have eight legs?
I mean they don't hunt pests around your house. Since they have very specific environments they come from.
to how all these families should be classified, as evidenced by the over 20 different classifications that have been proposed since 1900.
Anatomically, spiders differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the
their emboli, mature male sexual organs on pedipalps, stuck in the molt. Most tarantula fanciers regard females as more desirable as pets due to their much longer lifespans. Wild-caught tarantulas are often mature males because they wander out in the open and are more likely to be caught.
Lifecycle.
Like other spiders, tarantulas have to shed their exoskeleton periodically to grow, a process called molting. A young tarantula may do this several times a year as a part of the maturation process, while full-grown