lesson 26 nouns, and inter-lesson links

docs/howtostudykorean/unit-1/20-well-poorly.md

@@ -1138,7 +1138,7 @@ Until now, you have not learned how to say “I am good at something/I do someth
 
 The main meaning of 잘하다 is “<span class="md spoiler">to do something well</span>.” To use 잘하다, simply place a noun in a sentence with 잘하다 as the verb.
 
-This is easy to do with 하다 verbs (for example, 수영하다 and 공부하다) because to make a noun all you need to do is remove 하다 from those words. I discuss making non-하다 verbs into nouns in [Lesson 26](https://www.howtostudykorean.com/unit-2-lower-intermediate-korean-grammar/unit-2-lessons-26-33/lesson-26/ "Lesson 26: ~는 것 Describing Nouns with Verbs"), but the principal is the same for any noun form of a verb. All you need to do is:
+This is easy to do with 하다 verbs (for example, 수영하다 and 공부하다) because to make a noun all you need to do is remove 하다 from those words. I discuss making non-하다 verbs into nouns in [Lesson 26](../unit-2/26-describing-nouns-with-verbs.md), but the principal is the same for any noun form of a verb. All you need to do is:
 
 나는 (noun form of verb)을/를 잘하다. For example: