Aspirated or Not: Hearing the Difference in Devanagari
Launch library · evergreen read

Devanagari consistently distinguishes aspirated consonants, said with a small puff of breath, from unaspirated ones, said without it. क (ka) and ख (kha) look related but sound genuinely different, and mixing them up can change a word's meaning. English speakers often produce this distinction without realising it.
Since English aspirates certain consonants at the start of words too. The difference in Hindi, though, is meaningful rather than automatic, which is why it needs conscious attention when learning to read. A simple way to test aspiration is holding a hand in front of the mouth while saying a word aloud.
A stronger puff of air on the hand usually signals an aspirated consonant, a useful, low tech way to practise. A useful practice pair is पल, pal, moment, against फल, phal, fruit, two short, simple words that differ only in aspiration, a good early exercise for training the ear to catch this distinction reliably.