What is and some explamples of inertial frame of reference ?

[Anti Hydrogen]

I know this is a basic question, but I haven't understood deeply what a inertial frame of reference is, to be more specific, its relation with the first law of motion.

 

[jtbell]

but I haven't understood deeply what a inertial frame of reference is

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.

 

[rcgldr]

A simple explanation is an inertial frame of reference is one that is not accelerating, although the actual description is usually more detailed. Link to wiki article:

https://en.wikipedia.org/wiki/Inertial_frame_of_reference

Real examples of complete inertial frames probably don't exist, since gravity from objects in space result in some acceleration. However for practical purposes, a frame relative to some point on the surface of the Earth is often used as a frame of reference. For space travel in our solar system, the sun could be used for position and some distant star used for direction (to avoid a rotating frame).