Hello, I have a question about pruning. I have those two plants, which are almost 2 years old. But I do not know how to prune them, I want to make a small tree like bonsai. Here I draw few sketches how they look like.

I am afraid if I would cut, where no leaves or branches, I will kill the plant.

Hello, yes you might kill your plants if you cut off all the leaves. A picture (photo, not a drawing) of each plant would be very helpful if you could post one. It might be a good idea to wait another year for them to put on more growth before you prune them to the shapes you want. A general rule is never to cut off more than 1/3 of the leaf canopy at any one time when pruning. So, if your plant only has 15 leaves, you should only cut off 5 at most.

The plant makes food for itself from the sunlight using it's leaves. When it is just starting up new growth in the springtime, it needs lots of leaves to continue to grow and develop a good root system.