Your parrot needs some space. Provide a minimum of 1 m3 per parrot. Make sure there is a wearing pole, a separate drinking and feeding bowl in the cage. 

Preferably provide a wearing pole in the cage. That way, his nails will wear off by themselves. Hang the pole as high as possible, but make sure the bird can still sit on it comfortably, without bumping its head at the top of the cage. 

Regular washing is part of the basic care of a parrot. This bird species originally lives in a humid habitat. Dry air threatens to dry out the plumage, which can cause irritation and itching. At worst, your bird will even start plucking its feathers. So wash your parrot regularly with lukewarm water. You'd best do it around noon. So his feathers have a whole day to dry. 

When your bird starts plucking its feathers, something's wrong. This could indicate a clogged coccyx gland or broken pin feathers. By snagging its cage, your bird may break a pin feather. They like the powder that is subsequently released, so they continue to eat it. However, this can be very harmful for your bird. 
 
You should definitely remove the broken pin feather. Take a towel, put it over the bird and pull the pin feather out. Don't you feel sure enough about this? Then go see a vet. 

Just like a human being, a parrot absolutely needs his night's rest. Provide a quiet environment, in the dark, where the bird can sleep enough.

Never approach your bird with both hands at the same time to grab it. He'll consider this a threat. Pet him with one hand at a time. If you have to hold your bird to move it, for example, it is best to put a towel over it.