Vowels: standard - 'a' as in 'path'
Consonant combination - 'th' (dental stop) with tip of tongue lightly touching top teeth, combine 't' and 'h', while stopping breath. No nasal sound. Gives a hard 'd' like sound.
Emphasis - first syllable (kahth), second syllable (ahp) is short.
Avoid - 'a' as in 'cat' or 'lap'