if possible, I would like to know what is the best practies for SEO to put url in
Can you help me?
Bots can interpret relative as well as absolute URLs and follow them.
I would prefer absolute URLs as we can govern what the urls are, rather than leaving it to bot to find out and follow through them. It also provides the flexibility of switching the protocols from http to https:// even though the page is non secure or vice versa. Hope this helps.