Just curious about baby cereal and rice..

Br

So I saw a post here the other day about parents adding cereal or rice to their baby’s bottles. I have seen people do this before so I thought it was normal and something f you’re supposed to do once baby is a certain age. But in the comments mothers were saying there is no health benefits to it and some said its hazardous. So I was just curious if it really has no healthy benefits and if it does how should I give it to my baby once he’s of age...?

Please don’t be rude, I’m a FTM and just learning..