Gave up at 33%.
This topic is simply not the part of languages I'm mostly interested in, so it felt too dry to continue. And I'm sure it's not the author, because I read another one of his language books which was great!
Gave up at 69%.
I loved the beginning, but really disliked the world where Charlie's adventure takes place.
Gave up at 20%.
2021 seems like the year of abandoned books for me. This one has made me feel too much like I waste my time while reading.