General rules defining the driver's behavior in the event of a breakdown or accident, providing first aid

In the presented situation, are you obliged to signal the fact that you have parked a broken-down car on a road which is not an express road, if the car may be seen from a sufficient distance?

If you park a broken-down car outside a built-up area, are you obliged to place a warning triangle immediately behind the car or on it?

In the situation that you see here, while you park a broken-down car on the road outside a built-up area, are you obliged to place a warning triangle behind it at a distance of 150 m?

If you're involved in an accident on a motorway, do you have to signal the fact that your car is immobilized by turning on the emergency lights?

Is it correct to place a warning triangle at a distance of 30-50 m behind the car, if the car breaks down on an express road?

In the presented situation are you obliged to stop in all cases?

If you are involved in an accident in which people are killed or injured, do you have the right to remove its consequences yourself?

Are you obliged to give necessary aid to the victim of the accident in this situation?

Is it advisable to use a powder extinguisher to stifle burning fuel e.g. after a collision with a car?

In the presented situation, seeing the injured person with his head submerged in the water, should you leave him unmoved for fear of injuring his spine?