Melhores cumprimentos
Com estima. Respeitosamente.
"Olá" is how you say hello in Brazilian Portuguese.
"Beijos" is how you say "kisses" in Brazilian Portuguese.
You meant in Portuguese? Brazilian Portuguese? If so... Best Friend = Melhor amigo
Melhores cumprimentos, lembranças "My best regards" - Meus melhores cumprimentos
You would say "Eu sou brasileiro" in Brazilian Portuguese.
How are you in portuguese(brazilian) is "Como vai você?"
You can say "Estou muito feliz" in Brazilian Portuguese.
You can say "Eu entendo" in Brazilian Portuguese to mean "I understand."
You say "meu filho" in Brazilian Portuguese to refer to my son.
"Yes" in Brazilian Portuguese is "sim."
The problem in Brazilian portuguese is o problema.