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VISION
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LIGHTLY OBSCURED AREA (dim light, patchy fog or moderate foliage)
* Disadvantage on Wisdom (Perception) checks that rely on sight.

HEAVILY OBSCURED AREA (darkness, opaque fog or dense foliage)
* Effectively the blinded condition.
* A blinded creature can't see and automatically fails any ability check that requires sight. Attack rolls against the creature have advantage, and the creature's attack rolls have disadvantage.

LIGHT SOURCES...

* Candle: bright light in 5-ft. radius, dim light 5 ft.
* Lamp: bright light in 15-ft. radius, dim light for an additional 30 ft. 
* Lantern, Bullseye: bright light in 60-ft. cone, dim light add 60 ft.
* Lantern, Hooded: bright light in 30-ft. radius, dim light add 30 ft.
* Torch: bright light in 20-ft. radius, dim light additional 20 ft.

* Minor Illusion (cantrip): None, requires other light source to be seen, nor can it block light.
* Continual Flame (2nd level spell): bright light in 20-ft. radius, dim light additional 20 ft.
* Dancing Lights (cantrip): four orbs, each within 20 ft. of another light, each giving dim light 10-ft. radius.
* Light (cantrip): bright light in 20-ft. radius, dim light additional 20 ft.

* Captive Fire Beetle: bright light in 10-ft. radius, dim light additional 10 ft.

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SPECIAL VISION

* DARKVISION: Within 60 feet, see shades of gray in dim light as if bright light, darkness as dim light. Applies to dwarves, elves, gnomes, half-elves, half-orcs, tieflings (and most humanoids like goblins, orcs, ogres, etc.).

* SUPERIOR DARKVISION: As above but within 120 feet. Applies to drow.

* BLINDSIGHT: Perceive surroundings without relying on sight due to echolocation or heightened senses. With some such creatures, the deafen condition also counts as blindness.

* TRUESIGHT: See in normal and magical darkness, see invisible creatures and objects, automatically detect visual illusions and succeed on saving throws against them, and perceive the original form of a shapechanger or a creature that is transformed by magic and see into the Ethereal Plane.