The spelling of the word "gardo" is quite straightforward. The phonetic transcription for this word is /ˈɡɑrdoʊ/. The first sound is the 'g' sound, which is followed by an 'a' sound that is pronounced as /ɑ/. The 'r' sound after 'a' is pronounced as /r/. The last sound is 'do' which is pronounced as /doʊ/. Overall, this spelling follows the basic rules of English pronunciation and is not very difficult to learn or remember.