A black spider with a white dot on its abdomen is often a jumping spider or a similar species, depending on your location. Common candidates include:
Bold Jumping Spider (Phidippus audax):
Very black with a prominent white or sometimes orange spot on the abdomen.
Found across North America.
Known for its large eyes and jumping ability.
Spotted Orb-Weaver (Neoscona species):
Some species are black with white or light markings.
Commonly found in gardens or wooded areas.
Wolf Spider (Lycosidae family):Some wolf spiders have lighter markings that might resemble a white dot.
