I keep a vocabulary notebook. It's organized alphabetically. Whenever I
hear or read a new word, I write it down. Then when I have time, I look it up in
my dictionary. Then I put down some key information about the word... you know,
whether it's a noun or a verb, and some examples of how it's used. I go through
the notebook and study the words as often as I can. I really believe that the
only way to learn new words -even in your own language- is by memorizing them.