It’s only the point of origin that matters rly. U can just look up what country something was published in.
Manga is almost always black and white, and has a traditional comic book layout (each page is divided into panels) although that is also changing because reading digitally is getting more popular.
Manhwa & manhua are usually colored and in a scroll format, although I’ve seen those rules being broken, more often in manhwa.
Artstyle is always something that’s going to vary from artist to artist, it has nothing to do with whether something’s a manga or manhwa.
ill give u an easy identifier
manga first of all is always going to be presented in a black and white multiple panels in one frame its the easiest to differentiate
manhwa and manhua- i find that manhua is typically much 'softer' it follows like a water colour pallet and on average manhua reach 100+ chapters and sadly they're poorly translated meaning 7/10 times when something has more machine / choppy translations its a manhua as well as the fact- stereotypically for bl manhua uses either super english names due to machine transalation or chinese names can be simple to identify
manwa tends to be more 'sharper' and quite often korea itself is the setting as well as being able to differentiate on what names are typically are korean

Okay, I'm gonna sound really stupid rn, but I want to be correct. How do you tell the difference between Manga, Manhwa, and Manhua? I do know they originate in Japan, South Korea, and China. I mean like art style wise. Is there a way to differentiate them or should I just be looking at the authors name and going off of that? People always know exactly what type smth is and I just want to be able to as well. Also, don’t want to seem ignorant when talking/asking about things.