What do you have to pay attention to, when jacking up a motorbike on its centre stand?

You answered correctly. When using the center stand, a motorcycle can tip over if it is even slightly tilted since its balance depends on being upright. Additionally, jacking up a motorbike on a steep gradient can be difficult because the surface isn’t level, making the process unstable and increasing the risk of the bike falling. The suggestion about jacking up the bike from a seated position is incorrect, as it is generally recommended to do this while standing next to the bike for better control and safety. In the future, remember to consider stability and the surface when using the center stand.