by @0x94

The requirements.txt file contains the list of libraries required by SubDomain TakeOver, which you can install using

pip install -r requirements.txt

-d => domain
-w => wordlist
-t => thread
-f => sublist file

python takeover.py -d domain.com -w wordlist.txt -t 20

or

python takeover.py -d domain.com -f sublist.txt -t 20