When learning new words, using mnemonics is a great way to do it. Find a word in English or in your language that sounds like the new Korean word and use it in a sentence. One example mnemonic that I can remember very well is: CHEW THE (주다) food I GAVE you. 주다 means to give.

You can also use a small notebook and write down new words everytime you come across with. Everyday, aim for a number of words to memorize. But also, it is more helpful if you use those words you just acquired in a story. 

Good luck! ^^

song or write it down