Here's the best website for budgie/parakeet information:
https://www.cutelittlebirdiesaviary.com/
The drop down menus can be a bit annoying but it's packed with information.
It's especially helpful if you are trying to sex a young budgie as their cere is a different colour to the adults and it...
I've recently been hand rearing some cockatiel chicks to help out a breeder. I've never had a cockatiel and I am in love with them. Our kids have each chosen one to keep. They just want to ride on your shoulder and be cuddled. They are playful and funny, but they do live a long time. 15-20 years...