Could you provide me a splunk enterprise security learning links from scratch
Zero to hero classes..
All Splunk classes are available at https://www.splunk.com/en_us/training/course-catalog.html
Both free and paid courses are available. You will not get to "hero" with only the free courses.
Introduction to Enterprise Security its a free course of 40 mins
Administering Splunk Enterprise Security 7.0 is a paid course