While technically a true statement, the usage of kanji in Korea and Vietnam is now fairly limited - Korea uses typically a system based on combining sounds together nowadays (while you still see them use Kanji for names or titles here and there) and Vietnam has moved to (an accent-rich) alphabet during the French colonization .
I think the key was I bought tons of manga for children, the ones where all the kanji have the hiragana above them so you can get lots of vocabulary and kanji reenforcement from those.
While Korean uses a syllabary just like English, the sino-Korean words still have the underlying hanja. If you look up those words in the dictionary, it will show the hanja. [0]
From my understanding there are several usages of hanja to this day:
- Korean names. For the most part, given names will have hanja chosen by the parents/grandparents/family. However recently it's becoming more common to have pure hangeul names, or english/foreign names, with no associated hanja.
- To disambiguate homographs/homonyms. This is common on Korean tv shows.
- To represent countries, politicians, and surnames on news articles. For example, 朴 (surname Pak/Park) and 美 (USA). Here is a random article example. [1] and a list of common hanja that pops up. [2] Side note, it's humorous to me that the hanja used for USA is also the hanja for 'beauty' (미).
- For days of the week and months, I saw hanja being used somewhat commonly.
- To guess the meaning of unknown words. If you know a certain hanja reading like 비 or 경 then it makes figuring out words a bit easier.
[0]: https://en.dict.naver.com/#/entry/koen/27ed7d6b4161442885572...
[1]: https://www.chosun.com/politics/politics_general/2021/03/25/...
[2]: https://old.reddit.com/r/Korean/comments/km01fv/short_list_o...
edit: clarified about modern Korean naming practices.
Not necessarily true anymore. My wife has a completely made up given name that has nothing foreign: just two plain hangul characters without meaning on their own.
Some of the most memorable people I ran into in Korea were named 하늘 and 보라. I also met someone with a single character name, but I can't remember which character... I think 강?