Subdomain Takeover Vulnerability Write Up needed

penetration-testing
#1

Can someone tell me any good write up for Subdomain Takeover Vulnerability for a New Tester ?

#2

https://enciphers.com/2018/01/27/subdomain-takeover/

http://claudijd.github.io/2017/02/03/deep-thoughts-on-subdomain-takeovers/