When you are in a room, 'the three corners running length wise, breadth wise and height wise' is our frame of reference. We say 'middle', back, front, up and down' -all with reference to this frame. If we travel in a train, we have moving frame of reference.
Our earth spins about itself at 1000 km per hour. Our earth goes around the sun still more fast. No object in the universe lies at rest. Everything is moving. Hence Einstein defined inertial frame of reference. Inertial frame is one which moves steadily without any acceleration. All the laws of physics holds good in the inertial frame.
A compartment in a train which is moving at constant speed is an inertial frame. If all the windows of the compartment is closed and if the train runs smoothly, we may feel as if we are sitting in a room built on a solid ground. If the train stops or starts, there will be jerk (sudden acceleration) and we feel the movement of the train. In a steadily moving train, one can do any physics experiment and arrive at a inference. That inference will hold true in all the inertial frames.
That is what we are doing on earth. We know earth is in constant motion. We do many experiments and arrive at conclusions and laws. That laws can be applied to the satellites going to the space or any objects going to the moon, mars or even beyond the solar system. (We had put men on the moon and got them safely back on the earth. That is triumph of our science).
Even though earth is going at enormous speed, we do not feel anything. It is because, there are no jerks, no change in speed, no friction, no stop and start. The change in sky scenery is the only testimony to the motion of earth. A good inertial frame (The man is yet to design such a vehicle like earth).
In Non-inertial frame which is accelerating, everything goes into chaos. Even we are thrown away.
Steady motion is the way of nature.
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