I’ve heard Sailor Moon has two sailor scouts named Uranus and Neptune who are a lesbian couple in the original Japanese version.
Depends on what you are looking for, yuri is female focused romance and Yaoi is male focused romance. However I caution looking up those terms because they are also used for the not safe for work stuff as well.
I have found some lesbian stuff but it’s either just suggestive without any actual confirmation of lesbian characters or it’s over the top. Like Citrus had one kiss in the entire first season while Valkyrie Drive:Mermaid was way over the top. Not a terrible storyline though. I can’t remember the name of one involving small but apparently vicious shape shifting bears that was really weird. Maria Sama Ga Miteru was barely suggestive but some of those girls were definitely gay.
Sasaki and Miyano is canon BL. It's very cute, highly recommend. Other than that, most of the anime I've watched only have the LGBT implied rather than outright. Lycoris Recoil is airing right now. It's made references to one of the side characters being queer, and I keep hoping we're going to get Actual Lesbians but we haven't yet.
Revolutionary Girl Utena has a major canon relationship between two women, one of them being bisexual. There's also a lot of gender non-conformity in it too. No.6 is a sci-fi which also has a gay relationship between the two main characters. Promare is an anime movie with a bit of gay in it, but it's only at the very end. That being said I still consider Promare to be worth a watch.
Not an anime,but a wlw manga called "school zone girls". It's both an online comic and a physical book series which I'm pretty Sure is ongoing.
Someone already mentioned Revolutionary Girl Utena and Sailor Moon (and yes, Uranus and Neptune were most definitely lovers). But there was also some of it present in Magical Girl Spec Ops: Asuka, very sweet innocent hints of it in Cardcaptor Sakura (if you watch it subbed, or I suppose one of the newer dubs? I'm not sure). Citrus is another, but that one has had a pretty mixed reception (for good reason, I think), and there's a really cute one called Bloom Into You. I'm kind of drawing a blank on any others, but it's worth noting that while yaoi and yuri can contain sexual themes, they don't always (Bloom Into You is actually a good example of this). Some of them, like Valkyrie Drive: Mermaid can be a bit uncomfortable because there's an inherently sexual theme present (and all the characters are underage; I actually couldn't stick with it for that reason), but if you do some Googling, you're bound to find some lists for whatever LGBT fix you're after.