Good budgie food mostly consists of seeds and fresh fruits and vegetables. You can purchase budgie feed from your pet store or grocery store, this will make up most of your birds diet but you can also supplement it with other types of food like coriander leaves, greens etc., Try to introduce pellets in the diet as well as a seed-only diet can lead to obesity.  Never feed your budgie avocado, chocolate, onion, garlic, caffeine, alcohol or human junk foods. These are toxic to the bird.  Make sure the budgie has enough water to drink in its dispenser. The bird will know how much to drink. Change the water daily to prevent bacterial build-up. Add a cuttlebone. This is a good source of natural calcium for budgies. Mineral blocks can also be bought too. Some people may use liquid vitamin and mineral supplements, but those will be consumed through the fresh fruits and vegetables. This will keep the budgie safe from disease germs. Clean only with mild dish soap and water and avoid using any cleaning products unless you are one hundred percent sure that they are safe for birds. Try misting your bird with a fine spray from a misting bottle to keep the bird cool. When it's time to sleep, simply throw a light towel or blanket over the cage. Make sure there is sufficient air ventilation - you don't want to suffocate your new bird! Make sure that the bird cannot get its nails caught in the fabric.  This is also helpful when it's noisy. The blanket will muffle most sounds, and will also keep cold drafts out. If your budgie is frightened by the dark, add a little night-light. Don't let your bird panic. It might fly around the cage and injure itself. Take the budgie to the veterinary surgeon at least once a year for a check-up. If your bird acts weirdly or if you spot anything unusual, go to the veterinary surgeon as quickly as you can.  Look out for abnormal breathing, discharge from the eyes or the beak, mucus on the feather, abnormal behavior and a loss of weight. If any of these symptoms occurs, call the veterinary...

TL;DR in Vietnamese:
Cho chim ăn đúng cách. Làm vệ sinh lồng yến phụng ít nhất mỗi tuần một lần. Tạo môi trường thuận lợi cho yến phụng ngủ. Đừng quên theo dõi sức khỏe của chim.