Inertial frame and non inertial frame

If the position of any point relative or determined to other fixed point object in three dimensional space, the fixed point object is called reference frame. These objects are inertial frame that follows Newtonian classical mechanics and these objects motion can describe by Newtons law of motion. Inertial frame are these objects that that have a constant velosity relative to any objects, having no acceleration. Acceleration means speeding up and slowing down of velocity. That complying with newtons laws of motion, because, According to Newtons laws of motion, If no external force excerted static object will remain static and dynamic object will remain dynamic along with a straight line motion with constant velocity. But non inertial frame are these object in motion in three dimensional space that have acceleration, having no constant velocity.