A great way to practice these skills is by tracing letterforms. Take a photo or drawing of a beautiful letter (something curved, like a “G”, “Q”, “R”, or anything from a script alphabet), bring that image into Sketch, and use the vector tool to trace the outline of the letterform. Try to position your vector points at the outermost places on the shape, use vertical and horizontal handles, and fine-tune them by manually entering coordinates.
The impact of attachable cafes-on-wheels in traffic within an urban center is unclear. Should they become a nuisance, their use probably would be limited to certain hours of operation. In the center the demand side of the equation is also uncertain. Service pods might not be able to get through traffic to clients.