Darek's link is a great starting place, here's another:
https://theproaudiofiles.com/video/...01-peak-vs-rms/
Again, and I don't mean to piss on the party, I love people trying new shit but if you don't know the difference between peak and rms, you are a world away from ever getting in to mastering. I mean like 10 years from this point, if you dedicated your life to it.
But there's another facet to this conversation:
You're trying to master already mastered tracks. Everything in a DJ set (for better or worse) has already been mastered on a track level. It doesn't need mastering and worse, you're taking mastered tracks either playing them from a vinyl (RIAA processing) or from a DAC if digital, putting through a mixer which is adding some for of gain staging if not inadvertent compression/clip control, then back through a DAC for recording.
That's a whole bunch of processing on already mastered tracks, that if you then add more mastering to, gets imprinted on the master.
The ideal is to really "get to tape" as clean as you can with as little distortion as possible.
More mastering is just adding more distortion, and it's simply not needed. Just get as clean a signal path as possible with as hot a signal as possible before clipping and that's the goal.
Otherwise your compressing, eqing, limiting, spatializing (etc) tracks that someone has already spent the painstaking task of doing, and you're actually changing the tracks as they were intended to be heard.
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