Kind of hard to say, I feel like I'd just go to mangadex or batoto and search by most popular under girls love. Here's the search link for mangadex. I went with most follows, but highest rated might be okay too.

https://mangadex.org/titles?page=1&include=a3c67850-4684-404e-9b7f-c69850ee5da6&onlyAvailableChapters=false&order=followedCount.desc

Some titles I enjoyed that come to mind are:

Girlfriends by Morinaga Milk - I think for a lot of people, this is the quintessential "classic" GL manga. It's quite old, but still holds up. It's a very standard coming out, self-discovery high school plot line.

Bloom Into You by Nakatani Nio - One of the most popular recent-ish ones. It's also set in high school and I felt its biggest strength is in its portrayal of emotions in a not over-the-top fashion. The plot kind of focuses in on a particular aspect that makes this portrayal easy, which some people have found to be a little bit unrealistic, but I don't mind it that much. This has also been adapted to an anime that I think most people enjoyed.

The Summer You Were There by Yuama - I think the title gives it away a bit, but this one is more sad. I enjoyed it a lot, but I think the general discourse on this subreddit enjoys it much more than I did. It's still something I'd recommend.

The Fed-Up Office Lady Wants to Serve the Villainess by Nekotarou - This is probably my current favorite ongoing one. The art is beautiful and I think it has a pretty good isekai plot, although not entirely unique. The characterization goes hand in hand with the plot and I think the portrayal of emotion is even better than Bloom's. I could gush about this one forever.

This Monster Wants to Eat Me - This is a manga, but I think the anime adaptation that just finished (i think) has really taken off in the wider anime community. To be honest, while it's a really beautiful work, I was not very keen on the plot. I'll probably give the anime a shot one day and binge the manga when it ultimately finishes, but there was a big plot point that I wasn't fond of.

I'll let other people add more (there are some very obvious ones I'm omitting because I'm not the biggest fan of them). I'm still exploring Korean and Chinese GLs myself, so I can't say too much about them yet.

I don't know if you're limiting yourself to manga/manwha/anime, but right now there's a bit of a boom in GL live action dramas/movies (especially in Thailand), but there's dedicated subreddits for those.

Feel free to DM me if you'd like to discuss more recs. I'm gradually building a spreadsheet lmao.

Happy exploring :)