Yeah... as someone also from this country and blind, it did take me quite a long time to figure this particular one out, and I will say I am still not perfect at it. I also learned it from some sighted people and it wasn’t my parents lol. They did try explaining, as did several others, but I just couldn't get it until someone did that just... 'clicked'.
I don't know how well I'll be able to explain it when I can't actually show you hahaha, but I'll try:
If you're using something like a spoon, the part that would cut is not the front curved portion that goes in your mouth when you eat, but the side portion. So when you want to cut something, say ice cream or cake, you hold the spoon out in front of you with that tip portion held out in front of you. Then you make sure that your cake, icecream, chicken piece, whatever it is, is held in a stable position on the plate, relatively centered so that it won't move too much and be at risk of falling off the plate or scattering when you cut it. For this to work properly, you need it to be mostly still.
Then, holding the spoon in that similar horizontal position, press the side portion into the food item. Again, the sides as you are holding the spoon, just push that down, not the tip. You keep pushing until you feel it break through the food and then slowly start shaking it and moving the spoon side to side a bit. The idea is to stab deep enough to where you have divided the food, then to split it you move the spoon so that it breaks open. You jiggle the spoon, you move it from side to side, try different things until you find your 'groove'.
The pressing of the spoon can also take varying amounts of effort depending on what it may be, or sometimes it may feel like it's not working so don't lose confidence. Sometimes food is harder to cut, particularly with a spoon which isn't really the implement to cut things, so just keep at it. Again though, make sure your food isn't at the edge of the bowl, plate, etc., because if it cuts suddenly it can splatter everywhere.
Anyway, as I said, it's difficult to explain this in text and without showing you lmao, so I hope it made sense. Feel free to ask if you have any questions.