Prone

This is essentially RAW. It is listed here to be explicit.

While prone:

• you grant advantage to attack rolls from adjacent foes
• you grant disadvantage to non-adjacent ranged attack rolls
• your weapon attacks have disadvantage (except for crossbows)
• you can spend half your move to stand up
• you can move, crawling at 2x move cost

NOTE: On the turn you stand up from prone, you have disadvantage on attacks vs foes that were adjacent to you while you were prone.