Link doesnt work

Hi Chip, 
Thank you for helping the community with wonderful content!

As for the issues,
The link on the page 
https://huyenchip.com/ml-interviews-book/contents/2.1.1.1-technical-skills.html
[link] https://bestpracticer.com/topic/engineering-1521158538386x966527170501649400
is showing page doesn't exist,
Maybe the link is wrong?
