Unidentifiable speck/tiny insect/dust

Cannot be determined from the image. The image shows a red fabric surface, which could be indoors (furniture, clothing) or outdoors (e.g., a blanket on grass).

Cannot be determined from the image. If an insect, diet varies widely.

Given the lack of detail, if it's a small textile pest, they are often nocturnal, attracted to dark, undisturbed areas. Larvae cause damage by feeding. If it's a common house spider, they are usually solitary and build webs to catch prey, often in corners or secluded spots.

Cannot be determined from the image. If it's a textile pest, there's a risk of fabric damage. If it's a benign insect or dust, there's generally no risk or benefit.