Read,.. It all starts there. don't learn it by word, but by context (how it's used in as sentence). When you can't understand a paragraph or a sentence, your curiosity will help you remember that word. Don't forget to higlight that sentence and make sure to test yourself next time if you can still remember what that word means in that context.
Reading a word, then the meaning is a bit boring. I read instead. I get entertained, and I also learn.
Hope that helps :)