We rarely use Hanja. There're just some times when we are asked to write our name in Hanja, but a non-Korean won't be asked. I used Hanja like 男, 女, 大, 多 when I was doing note-taking in school. We used to see some Hanja a lot, so when we see it, it almost comes across as a symbol, I think. Korean learners don't need to learn Hanja. Study Kanji when you learn Japanese. Study Hanyu when you learn Chinese. :)