I don't think you get me Master.
For us to give advice, we'd need to hear
your recordings,
and your target recordings.
Even then it's still a difficult thing to offer advice on.
When people talk about boosting certain frequencies, it's the same scale across the board.
A parametric eq with a graphic visual is probably the easiest eq to learn on.
Like
this.
Every eq plugin you use should have a scale of frequencies so you can boost or cut lows, mids, highs, etc.
They usually go from about 20hz to 20khz, which is generally accepted as the optimum range of human hearing.
There are basic types of adjustment that you can make. Google this, you'll get pictures that are easier to understand, but.
A notch is like a little bump on your eq, or a little cut. It can be wide or thin, but it's still a notch.
A high pass will slope downwards toward the left (bass/low freq end of the scale). It allows higher frequencies to pass.
A low pass will slope downwards toward the right (high freq end of the scale). It allows lower frequencies to pass.
High shelf will let you raise or lower the high frequencies without adjusting the bass.
Low shelf will let you raise or lower the low frequencies without adjusting the highs.
For example, boosting 80hz on a bass track can emphasis the boomy qualities of it, but boosting 8-10k on a drum kit will bring out hi hats, cymbals and snare crack; Stuff that's high pitched.
If someone says, "do a boost at 80hz" you'd probably get out a narrow q (width) notch on your eq.
If they haven't heard your track though, don't bother!
Hope that's useful to you.
The absolute best thing to do IMO is literally just play with the eq plugin. Move things about at random if you don't get it. Your ears will soon tell you what's good and what's not.
Pretty much everything I've learned was by ear, whether playing an instrument or mixing a track.
The theory came later, and while I think it's great to have, the instinct is the most important but, for me at least.
Plenty of great pianists can't read music Massa!