The current 'standard' or most common tuning is G'CEA also called Reentrant Tuning. Most of the music is based on this tuning.
It has evolved over time, for the most part as music styles have changed. There are at least 3 other tunings that are used by musicians on their ukukleles, including the Slack String tuning, the Low G tuning and the Canadian tuning.
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Depending on how you are learning1, 2, 3, and 4G'CEA
A C tuned ukulele (gCEA) will produce a C6 chord when strummed with open strings.
There are a lot more than four chords but the string names are GCEA.
It will depend on the tuning and size of the instrument. On the baritone size the lowest note is going to be the D string. On the GCEA tuned ukulele, it will be the C string.
It's the tuning for a ukulele - 4 strings, tuned with either a high or low G (high is usual).