Portuguese: An Essential Grammar is a very helpful review of the correct grammar for learning Brazilian or European Portuguese. It is easily & simply formatted for fast reference and extremely helpful. I suggest using it in conjunction with this handy little Brazilian grammar book Português Descomplicado. And you can also combine Portuguese: An Essential Grammar with a Portuguese-Only textbook, such as Falar Ler Escrever Portugues Text (Falar...Ler...Escrever...Portugues) (Portuguese Edition).