I learned /ɑ/ and /ɔ/ represent two different vowels.
However,recently I read a book, the American writer said she didn't differentiate between /ɑ/ or /ɔ/. She used only /ɑ/ for everything so I think dog, door,caught, cot, core, car must be /ɑ/.
It's easier for me to just say that everything represents /ɑ/. Though, I learn new words with /ɑ/ or /ɔ/ from reading,can I pronounce them with only /ɑ/?