EQ (Equalization)
introduction
Equalization means the adjustment of various bands of frequency to change or optimize those sounds. In Audacity, this is mainly accomplished with the filter curve EQ or the graphic EQ. When you Google for more information, be sure that you search for eq and equalization to get the results that you want.
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wikipedia on equalization: https://en.wikipedia.org/wiki/Equalization_(audio)
an article with tips on equalization: https://www.armadamusic.com/university/music-production-articles/eq-explained-the-basics
tip on using a spectrogram to identify which frequencies to cut using EQ: https://www.loopmasters.com/articles/3172-Spectrum-Analyzer-Tutorial
from the manual on using the graphic EQ in audacity: https://manual.audacityteam.org/man/graphic_eq.html
from the manual on using the filter curve EQ in audacity: https://manual.audacityteam.org/man/filter_curve_eq.html
advice on using EQ in audacity: https://producer.musicradiocreative.com/how-to-use-the-audio-equalizer-in-audacity-audacity-tutorial-for-beginners/
video
a very good introduction to EQ: https://www.youtube.com/watch?v=I6ZF_NHvqzU
another great but quick guide to EQ with wise tips on fixing mixes: https://www.youtube.com/watch?v=jDGFZMKeGHY
super concise intro to EQ in Audacity focusing on voice: https://www.youtube.com/watch?v=U5QtkxrnFr4