The best way to pick up on these chord variations is to listen to the melody. It's often easier to work out single notes than it is full chords. If you can figure out how to play the melody, all the better. Melody notes are often picked up on in the chords. So if you can find these notes, they will help you find those subtle chord variations.
Ukulele come in many different tunings, and some even have more than 4 strings. For the purposes of this article, we'll be dealing with a standard Ukulele - one with 4 strings and in GCEA tuning. We also assume you're playing a right handed ukulele. If you're playing lefty, simply flip the instructions around.

Ukulele for sale 3/2 means that you press down a left hand finger on the third fret of the second string. I haven't told you anything about which left hand finger to press down on the frets on your ukulele.
R: Rocky Robot Dance: Robots have very jerky movements. Play some lively music. Dance along as if you were a robot. Move very stiffly, with your arms flexed in front of you. If you want, sing along to the music, using your best monotone robot voice. Keep dancing while you sing!
Listen to lots of ukulele players. The more you listen, the more you'll get a feel for the ukulele and the way it sounds. It will influence how you play subconsciously.
Ukulele for sale in uk Check your fretting by playing the A string on by itself. Does that note sound brightly? Is it muffled? Does it sound like it is in tune with your other strings?
0/3 indicates that you play the third string with your right hand thumb for example without pressing down any left hand finger. It is called to play on the open third string.