An inertial frame of reference is defined as a frame that is not accelerating, which is crucial for understanding Newton's first law of motion. While real-world examples of complete inertial frames are non-existent due to gravitational influences, a practical approximation can be made using a stationary point on Earth's surface. For space travel, the sun serves as a positional reference, while distant stars can provide directional guidance to avoid complications from rotating frames. For further details, refer to the linked Wikipedia article.
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What have you read about inertial frames, and what, specifically, do you not understand about them? The better you can focus your question, the better will be the the responses that you will get. Otherwise you will get responses that lead in many different directions, with no guarantee that any of them will actually help you.Anti Hydrogen said:but I haven't understood deeply what a inertial frame of reference is