Prone

• A prone creature’s only Movement option is to crawl, unless it stands up and thereby ends the condition.

• The creature has disadvantage on Attack rolls.
• An Attack roll against the creature has advantage if the attacker is within 5 feet of the creature. Otherwise, the Attack roll has disadvantage.

Causes

Common Causes: the spell Grease and Command, Dragons, Wolves, Minotaurs, and Stone Giants

Affected Groups

Why it matters to players: Prone is the easiest condition to counter. Standing up only takes half of your turn’s movement and requires no additional actions. However, that still has to happen on the Prone creature’s turn and they cannot stand up if their movement speed is 0. This means you can Grapple someone while Prone, benefitting from both conditions until they break free or the Grappler is removed from play.
It is also worth noting that going Prone on purpose can occasionally be a good thing. In the rare circumstance that a sniper is attacking the party from a long distance, the party can crawl to give the sniper disadvantage on hitting them. It might sound a little silly, but it does work by the rules!

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Why it matters to DMs: This effect is often a rider on a creature’s main attack actions and only increases your chances of hitting the party with a melee attack for free. We’d recommend this for use against player characters that seem impossible to hit or that skirmish a lot. Limiting mobility in 5e matters a lot due to Attacks of Opportunity.

https://halflinghobbies.com/every-condition-and-how-to-use-them-in-dd-5e/#Blinded