My advice would be to keep it consistent whatever you decide to use.
I prefer absolute URLs. That’s just a preference. Google will crawl either if the local setup is correctly developed.
- What is an absolute URL? Example – http://www.surjeetthakur/search-engine-optimisation/
- What is a relative URL? Example – /search-engine-optimisation.htm
Relative just means relative to the document the link is on.
Move that page to another site and it won’t work.
With an absolute URL, it would work.