Now do that with eight channels. Then add an eq to one. Pan half, left half right. Etc. It's not hard, just tedious. It's like learning to walk. One step at a time. At minimum, to mix, you should learn how to use a parametric eq, with shelf / cutoff, what a compressor is, and how to delay. Most other audio devices are some variation on eq, compression, or delay. Reverb is just a type of delay. High gain guitar (metal distortion) is just compression in a tube. Eq is everywhere.