Kill everything else in the cave but the one you want with a giga. Then approach with ghili and bug repellent on FROM THE SIDE. He will not see you and you can tame at leisure. You can stay crouched next to him.
If you tame this creature outside a cave(especially revival tame etc.)Creatures on every cave will still argo you, if you want to be ignored and be vulnerable(unless u don't attack any of them) against cave creatures/caves, tame a araneo/arthroupleura inside a cave, once you've tamed it, no cave creatures will attack you(unless you won't attack them).Make the arrow green so people can know this before taming it.idk if this work on pc, but works on mobile for me.:v
Taming tip! Lead them to water! Araneo will lose aggro once it submerged in water so just swim downward and wait for it to stop swimming, then swim back up to it and feed spoiled meat till it drowns or till it’s tame, whichever comes first lol. Great way to get one with a good oxygen stat! 😂
Cheesy tip: mount a scorpion or Arthepluora or even another Araneo, walk up to the one u wanna tame while sitting on your tamed insect and feed it. For some reason none of the Dino in game agro on insect type dinos what so ever ;)
Make 1 foundation and put 8 walls on it making a 2 high box without a lid, drop the spider into this funnel like trap, when you see it's legs show through the trap from the outside look at them directly and you can feed it, you do not need bug repellent for this
So, biggest thing no one tells you on here. If you only have repellant and no ghille, put it on and go at them from the SIDE!! Not head on, not directly behind. The side. Never aggros on you that way. From the back and front even with repellant it aggroed 3x each before i tried it this way.