Mainly news. For that I follow the news sites but am hesitant to follow editors, columnists, journalists etc as they tend to post useless comments that are supposed to be funny. I do follow them but unfollow once they become a wannabe comic with unfunny puns, oneliners etc. For similar reasons, I don't follow well known tech bloggers (though I read their blogs or medium posts).

Secondly, I follow handles for topics such as museum, history, science etc. I generally distrust curators who seem like enthusiasts, so try to follow authentic sources as far as possible.

Thirdly, I follow some highly opinionated people, many of whom are usually well known from all walks of life, while some I find by their responses to certain topics. It is fun to see how people can twist anything to fit their agenda.

Lastly, I follow official accounts of various national governments, and organizations like UNESCO, RAND, PEW etc.