Creating a database for users to submit info and lookup info

Hello!
Today I'd like to ask a simple question, it's probably been answered elsewhere on stack but please, if it has kindly redirect me. Anyhow, i am looking for a concept per se. Anyways I'll try to get to the point. I'm looking for a method for a website that would have a couple of Queries for the person to submit data, I have set up a basic one with POST & GET requests although i understand that is just with cookies, i think. Thing is, i want it to be a public website where people can submit data, and then other people can search for that said data via tags meaning, anything that is inside the data and or a special code the user chooses.

If i could get any help or recommendations on where to look or even some tips, that'd be really helpful. Thanks. *