Being a Chef I recommend sharpening your knife with an emery stone every time before you start cutting any vegetable or meat. This will make your work easier. You have already found the rest of the tutorial here. The most important thing is to always keep your knife clean.
I didn't even searched for it.. But this was most important shorts to watch for me 😭😭 I daily get task to cut onion and tomato but i end up taking almost half an hour for this 😂