As for Japanese fittings, while there are many names, most of them do not have a clear usage distinction. Japanese people sometimes use words by feel, which can be confusing for learners of Japanese. However, Japanese is a language that is very sensuous and has ambiguity in its language. It is better not to try to clarify word usage at the beginning, because if you worry too much about grammar and meaning, you will not be able to speak.
https://www.youtube.com/channel/UCJyb6vceAjGazPPGjJs-1Yw It has Japanese subtitles, so I think it'll be useful