I do believe that most insects (arachnids included) breathe through the pores in their skins.

...Yes.

I think it's interesting, breathing through pores seems like a much more effective and safe way to do it.. us humans only have 2 holes and 1 tube to breathe through. Seems inefficient and dangerous

every living thing does my friend

actually there are plenty of organisms that don't require oxygen.

I like how I am actually learning interesting things here.

oh that's true.. but insects and spiders still require oxygen nonetheless

But do they have some sort of lung like organ or do they just do something like absorb it through their skin?

en.wikipedia.org/wiki/Spider_anatomy#Breathing

they have tracheae rather than lungs which carry oxygen throughout their bodies through pores on their skins