prononci

The verb a beginner needs least, in the language that needs it least. Esperanto's spelling is fully phonemic: one letter, one sound, always, with no silent letters and no digraphs. The stress is on the second-to-last syllable of every word without exception, so prononcas is pro-NON-tsas. Once you know the alphabet there is nothing left to ask, which is why kiel oni prononcas is a question you can stop asking after the first week - a fair claim to make about no other language on this site.

Two spelling notes on the word itself. The c is ts, not s or k: pron-ON-tso. And the noun is prononco, the pronunciation, while elparoli is the commoner everyday alternative to the verb. Where speakers differ is not in which sounds a letter makes but in habit: a French Esperantist and a Korean one will still sound different, and the movement's long-standing rule of thumb is to aim at being understood by everyone rather than at any national model.