Webtoons is site with official translations, was created by https://naver.com/ to combat fan translations (and this fan translations made many of Korean manhwas popular around the world in the first place). Manga are Japanese comics, manhwa are Korean comics, and manhua are Chinese comics.
All other sites you mentioned are fan translations (scanlations).
https://www.webtoons.com/en/
If that's the one, it looks like an online manga reading website. There are many of those around. eg mangakatana, reaperscans, mangadex, etc