In addition to the criterion channel, already mentioned, try MUBI [1]. It’s a cinephile’s dream: a film discovery nearly everyday while also curating the great directors.
One can also find very interesting stuff on YouTube, depending on how good your search skills are, I know that at the start of the pandemic I had discovered a user who was uploading Italian western spaghetti movies in HD format. I think I might also have found something similar for Hong Kong wuxia movies from the 1960s and 1970s but I'm not sure.
One can also find very interesting stuff on YouTube, depending on how good your search skills are, I know that at the start of the pandemic I had discovered a user who was uploading Italian western spaghetti movies in HD format. I think I might also have found something similar for Hong Kong wuxia movies from the 1960s and 1970s but I'm not sure.