I've encountered spiders that were harmless...black widow & the likes i've never had an encounter with & i thought tarantulas were poisonous
black widows are actually very docile, they just like to hang out in their web most of their lives... most people are bit by them because they inadvertently grab one when moving something around, mostly by accidents...
the fiddler, or recluse, is a wanderer that hides in your empty shoes or clothes...