There are also genres on the left side of browse to select. I would assume not much horror in racing and sports games. But after you found games you like, you will see what tags are used there. You should know at least a little bit what type of game you search for. Tags can be anything. Even banana is a tag.
There are sections linked on itch.io homepage directly, like fresh and featured. There is also the top-rated subsection of the browse section. https://itch.io/games/top-rated
And hidden on the bottom of the homepage is also this, if you have no clue what to play. https://itch.io/randomizer
But if you go to popular ranking, well, horror is popular, you get what you browsed for.