I do not agree with hi passing.low passing everything or anything in a swoop.
You can learn some stuff about eq by sweeping about.
but whats good
or something that is bad.
These are actually the real questions about eq that will contribute to you finding the best stuff in sound.
For example on a guitar good might be the cabinet boom - but you might have enough of that
Bad might be in the mids, something that is there that does not need to be but ounds better when removed. Problem is you can take away the character of the instrument if you just grab at random for something say at 400k and remove.
Good might be the pick attack in the 2k regions (it might not be there however so take 2k as a complete bit of random). However boosing here might bean the guitar sounds thing cos youve gone hard on the boost loosing the rest of the information.
And the my fav is when you get into boosting into a compressor. You thing that cutting at 50hz tighens up stuff, try boosting at 60-100 into a compressor. The frequency you push will trigger the compressor. You can tighten up the bass end and then eq stuff after the compressor to bring out the top, nice and tight but sharp and clear.
You see, its a big area for starting points, and starting points are not even the beginning if someone suggests something and leaves you fucked cos you are in the wrong area working.
I wish I had been given starting points, but if you want a starting point get your head out the clouds, they are not real and only work for any given circumstance.
Go here:
http://www.recording-microphones.co.uk/
Have a go at downloading the mixes and seeing how it goes. You might not like the tracks, but you should be in engineer mode, if you can do that and foxus on it then leave it to the AE's otherwise go for it, and let others listen to your work and compair to the final product. This can help quite a bit and may change your perspective of EQ.
Really dont force it to learn at your pace, you do get better and things get clearer, but honestly presets just dont work.