to first tame one you should get bug repellent so the bugs in the cave don't agro on you but with that you can't get to close to the bugs bc thay will agro. so you can try gilly and repellent if you can then get something long range torpor weapon like a cross bow with torpor arrows or a long neck rifle with thank darts and make the spider go to sleep. then get spoiled meat and put it into the inventory of the spider and it will start tameing.