Apex domains cannot have CNAME records.
Question and response
Question
dig orspringworkbook.com. NS
Answer
orspringworkbook.com. 5 NS ns-115.awsdns-14.com.
orspringworkbook.com. 5 NS ns-1343.awsdns-39.org.
orspringworkbook.com. 5 NS ns-930.awsdns-52.net.
orspringworkbook.com. 5 NS ns-478.awsdns-59.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0