Help don't no what to do
Can anyone give me advice on what to do, I have 100s and I mean 100s of black spiders running round on the gravel in my front and back garden, they are not tiny ones they are quite big about a cm in diameter. I am scared to walk on gravel in case I kill them. Good job I'm not scared of spiders. Can anyone tell me why they are here and what to do please.