How can I continue to learn Portuguese ?
I learnt Portuguese when I was in college one year ago but now I graduate from college. When I was in college my teacher had taught me grammar. So I want to know how can I continue to learn Portuguese at home. I guess I should remember a lot of new words as possible as I can. Right?

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Como nosso amigo Murillo falou, existe na internet várias formas de praticar.

Deixo o link de um e-book para te ajudar um pouco.

https://books.google.com/books?id=FCqMGRTp22EC&printsec=frontcover&dq=subject:%22Portuguese+language%22&hl=en&sa=X&ei=aQRSVYCGFc_roASiiIDoBg&ved=0CEAQ6AEwBQ#v=onepage&q&f=false

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You can watch a brazilian series or soap opera on Youtube;
You can read a books or practice with native people.

The link that Rafael passed is very good.

Você pode assistir a series brasileiras ou novelas no youtube;
Você pode ler livros ou praticar com pessoas nativas.

O link que o Rafael passou é muito bom.

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Listen to the media on youtube. 
Listen to radios online on tuneln (android app)
Read websites in Portuguese
Read books
Write as much as possible
Talk to people
Download some textbooks and study by yourself.

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You could search for someone to talk to you in portuguese. It's so much better and fun learn like this. You can make friends here, on italki, that can help you to improve your portuguese, isn't that hard.
I'm brazilian, i can help you if you want to, contact me :)

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You can use this book: http://pt.slideshare.net/soniagalinha/portuguese-an-essential-grammar - it is called "Portuguese, an Essential Grammar". I use "Thai, an Essential Grammar". I hope it helps! =D