I'm often told that a site I want to visit is unsecure, so I don't go and am left curious. Let's say I go to a site that doesn't have https, but I only go to browse. I'm not knowingly entering any personal information, what would I be at risk of?
That the traffic is intercepted and anything that you type in such as passwords or credit cards is stolen, that the content you see is discovered by a third party (ie. Someone finds out you've been reading X specific content on the website) or that the data is altered in flight and injected with false links or other false information.
It's usually no big deal to visit an "unsecure website" for informational purposes if you don't type in any sensitive info.
Generally speaking treat it like a postcard where everything you write could be read or altered by "mail employees" or other third parties.