What is the utility of things like the ideal gas law if they don't accurately model reality?

Excuse me if it's an ignorant question. I'm in gen chem 1 and I'm just learning about the ideal gas law. The professor mentioned the assumptions it makes:

1. atoms/molecules of gas do not interact with one another

2. volume of combined gas particles is negligible compared to volume occupied by the gas

If these two assumptions, which are false, are necessary to utilize the IGL, why is it used at all? It seems to model a false image of reality. I'm sorry if I'm not wording this well, I'm just a little confused.