I used to use the /r/television sidebar but it isn’t very comprehensive. More recently I’ve been using Wikipedia’s 2023 in American Television page, specifically the debuts page, which is good. Some other countries have their own pages, such as South Korea.
Know of any other good places?
I use a site called airdates.tv. I color code shows green if I definitely want to watch and yellow if shows Ill watch if there’s nothing else to do. If I see a show I haven’t heard of, there’s a bunch of links when I click on the show to find out what it is.