I see monolingual English speakers who confuse to/too/two, there/their/they're, etc. It's hard to blame them because these word triplets are pronounced the same, so why bother distinguishing them in writing.
Knowing how these words map to different languages reinforces their distinctions. There/their/they're in Chinese are 那裏 (na li) / 他們的 (ta men de) / 他們是 (ta men shi).
This goes deeper and works for homonyms like free, which maps to 免費 (no cost / gratuis) vs. 自由 (freedom / liberty). It makes you think harder about what you mean when you use the word free.
Learning different languages challenges your assumptions. An Euro-centric upbringing would assume that spaces are required to separate words. Chinese and Japanese disagree with this and work just fine. 26-letter alphabet vs. thousands of characters. Implicit tones vs. prescriptive tones. Context-dependent letter shapes (Sanskrit). Optional/implied vowels (Arabic). Word order (SVO etc.).