From the pic, the wine seems to be from the south of france. If a wine is labeled Vin de Pays (it translates in to Country Wine), it usually indicates an entry level wine. Since it’s a Vin de Pays d’Oc, it means that it’s entry level wine from the Languedoc-Rousillon region (south of France).
Merlot generally a makes a softer style of wine compared to other varietals which is why it’s rather tasty and pairs well with a wide range of food. I dunno where you can find this specific wine in SG but there are many entry level wines from good producers in good regions that you can start off with. Carrefour is one of the places you can look at without breaking your budget. Try entry level wines from the Rhone Valley, they are called Cotes du Rhone and the ones from good producers offer very good value.
Yellow Tail (YT) is the one brand the wine industry picks on because many experienced drinkers would rather top up a couple more dollars to drink better quality wine. Not saying they make terrible wine, but they don’t make good wine and life is too short to drink average wines. As for moscato in generally, it is a very palatable style of wine especially in SG due to its sweetness and we generally have a sweet tooth. There are many other high grade moscatos that delivery more complexity other than just sugar.
Good on you that you want to explore more. What is your current budget? When you first start off, you should start with getting a good grasp of typicity; meaning drinking deeply to recognize various varietals. Perhaps every month you drink a certain varietal, so lets say for August you only drink cabernet sauvignon (red) and chardonnay (white). And every month you change varieties. This is so you get a good handle at least on the wines.
You can join the next makan session, or class

, that I am trying to organize in August and we can share our experience and queries there together also