Unless you are a mechanic, it may bel worth taking the car in to a professional who will be able to pinpoint the problem exactly and then advise you accordingly.
Fuel injectors can become clogged-up through driving. The fuel filter may even be the problem. This will become clogged-up with dirt and grease through driving over a period of time. If this is the root of the problems and is causing the car to jerk, it may be worthwhile replacing the old fuel filter with a new one.
In older cars or those with a large mileage, the transmission may be on the way out and this may be the reason for the car stalling and jerking, even while in a stationary position. If you suspect this is the problem, get the vehicle to a mechanic as soon as possible to minimise the problems to the car and your bank balance.
Learning to drive or driving in a new area can be stressful. It can be so stressful that forgetting to put the foot down on the clutch when changing gears may become more common. This may cause the car to jerk and even stall. This could be dangerous, especially on a busy road so take your time, stay calm or book in for some extra driving lessons.