I am very new to indoor rock climbing, I want to climb barefoot, I heard some people advise against it,
Anybody here has any experience or can give any suggestions on barefoot indoor rock climbing?
You definitely can do it, and it is fine where you have clean, dry climbing surfaces. I have had no problems doing it on occasion in the summer when I have not had my rock boots, but I wouldn't want to do it.
I don't know how practical it is to train this way though, as if you decide to climb outdoors it will not be as useful as having learnt the skills with proper rock boots.
Rock boots require a slightly different technique, but are much grippier and you remove the risk of catching a toe on something!