Where can I go to see and understand more on baby items before buying?

I used to just view around online and looked at the items mindlessly. cause there are too many stuffs and it was really confusing to which I wonder what is needed, what is necessary and etc. Until I started going to like mothercare, kiddy palace and there are many experience promoters, so I threw alot of questions to them like "what is this for?", "what it does?" is it a necessity? and more... that's when I really understood what are those items about and based on my own interest what I find important and what's not. Most of the time, they will also share with you their experiences and I think I learnt alot by talking and asking.