What is the best way to store photos so that spiders and such don get in them?
A good camera store will carry acid-free storage for photos and negatives. You can use boxes, which are cheap and can hold lots of small photos, or binders with sleeves to put the photos and negatives in. Store them in an area that doesn’t get too hot or too cold, and has low humidity year-round. A closet shelf is much better than an attic, basement or garage.