The document provides 3 tips and a bonus tip for improving singing ability in 3 days. The first tip is to take 3 deep breaths before singing. The second tip is to warm up vocals for 1 to 3 minutes. The third tip is to record vocals, listen back, and rerecord to self-correct. The bonus tip suggests regularly practicing 1-2 songs to learn them thoroughly and using the other tips to enhance singing.