Mangas r generally black and white... And it will make sense when the name mentioned or kun , San, etc,... Or... While reading you'll see that left to right won't make sense... Cuz, zapnese lit r written from right to left.....
Manhwa r colred.. U can also tell by experience with art style or name like... Kim, Lee,,, names with ending won.... It's written from left to right...
Manhua r generally one where art style r very cliche like very thin chin or v cut shaped faces... Or kinda like Japanese where flowers can be seen when something good happens but in colors... And names r like.. Hua, weixwei, lin, lan.... Suiji, etc... It also written from left to right...
Hope it helps...
I know the difference between them:
Manga: Japanese
Manhwa: Korean
Manhua: Chinese
But how would I know while reading? Like is there a difference and if there is what is it?