Hi, well it totally depends.
Do you mean the EQ of your amp or recorded guitar tracks?
When it comes to recorded guitar tracks, it actually really depends on the recordings itself.
First of all you can always apply some hi pass and low pass (taking out everything below let's say +/-100 hz and everything above +/-8800 hz)
Then you can listen to how it sounds, does it sound too dark/warm? then you can eq out some lower range for example around the 400-500 hz range. Does it sound too bright? Experiment with getting some frequencies lowered between 3000-6000 hz.
There actually is no wrong or right way, because every guitar track is totally different.
The most important is to actually make sure the recordings itself are already as good as possible, so you only need to apply small amounts of eq.