Overall levels determine the loudness of the video as a whole. Twelve sound effects stacked on each other, covering a loud portion of music will most certainly cause the audio meters to peak. When audio peaks and the tops of the meters turn red, this can result in clipping audio that sounds distorted (and wayyyy too loud) to the listener. As a very general rule of thumb for internet deliveries, I try to make audio levels peak around -6 dB. That gives some room for cushion and won’t blow some dude with earbuds out of his subway seat.
Coloring
Color correction and color grading are part science and art. Color is a surprisingly complex subject, but we can achieve some great results without getting too textbook thanks to simple sliders, color pickers, and a bit of Adobe Sensei magic.
Lumetri Color – Basic Correction

Correcting the color in a clip is as simple as grabbing a proper white balance using Lumetri’s WB Selector. Click the WB Selector tool (color picker) and in the program monitor click on a part of the image that is what should be white. Changes are instant. You can continue to tweak using the sliders in the Lumetri panel, making sure exposure, highlights, shadows, and saturation look how you like.