hello! i’ve already seen s1, so that’s why the thread title doesn’t include it
therefore i’m mostly just curious if s2/s3 are required, but if anyone knows if s1 is required also feel free to say that incase anyone who hasn’t seen an uma musume looks at this thread
ty!

No not required, each season focuses on different horses and their own rivals. But if you want to know who some of the supporting characters are and their relationships (world-building stuff) then you can watch the previous seasons. I highly recommend the latest movie though (Uma Musume: Pretty Derby - Shin Jidai no Tobira), the animation and production quality in that is definitely top-notch.
Should you do it? Yes
Do you need to do it? Not really
Uma Musume follows different horses in different time periods and Cindrella Gray in particular starts before the main series so, you should be fine starting from here but, I do recommend watching the anime firsthand as it is a better experience that way, regardless.