In tab nomenclature, an x on a string indicates that it should not be played.
There are four strings on an ukulele. So you would have four notes.
The strings on a ukulele produce the notes G, C, E, and A.
The ukulele strings are typically tuned to the notes G, C, E, and A.
To tune a ukulele, you need to tune the notes G, C, E, and A.
The ukulele strings should be tuned to the notes G, C, E, and A.
The four strings of a ukulele produce the notes G, C, E, and A when played open.
The four standard strings on a ukulele are tuned to the notes G, C, E, and A.
To tune a ukulele, you typically need to tune the strings to the notes G, C, E, and A.
The number of notes and the ones they have. Guitar will have 6 notes and an ukulele will have 4.
The Ukulele Tabs site linked below has them.
The normal (current) tuning of an ukulele is G'CEA.
The link below has the links to the ukulele chords for Happy.