How to study Korean - Lesson 5: Korean Conjugation: Past, Present, Future | This page explains the addition of "았다 or 었다" with past tense conjugation - very useful - I'm liking this site so far. I really recommend the Mirai Korean app too, because it explains all the pronunciation rules well so you can translate what you hear into hangeul and look it up.
Learn Korean Online: How to Choose the Best Course Learning Korean online can be a fun and convenient way to learn the language. However, you need to know what kind of course will match your goals and your personal style. We'll let you know what you look for!