Spiders very rarely bite humans, but that isn't because their fangs are too small; most could bite if they tried.
"Daddy-longlegs" means harvestman (not a spider), crane fly (an insect) or pholcid spider, depending on who's talking! So it's really meaningless.
Orb (spiral) spider webs are neither the most common type nor the "normal" or standard type of web.
All spiders make silk but only about half make a web (silk structure to catch prey); others hunt or wait for prey.
All arachnids, not just spiders, have four pairs of legs.
"Arachnid" doesn't just mean spider. The 11 arachnid orders include scorpions, ticks, etc.; spiders are just 1 order of class Arachnida.
Are spiders insects? No, they're arachnids, as different from insects as birds are from fish!