Happy to help!
As far as the color management conversation – it’s good to understand it, but for most cases in AE, especially when working with graphics for display on the web, I recommend working in an unmanaged color space. This passes through the actual RGB values of your assets without otherwise manipulating the appearance. You can then make any necessary color transforms on layers within the comp.
For instance, if you have a piece of log footage and a piece of linear footage, use OCIO to convert one asset WITHIN your composition, not under the hood, to get both assets into the same working color space. Similarly, you can always output a different color space at the end by applying a color transform to the final comp (precomp it, or add an adjustment layer to the top).
I’ll note that these kinds of management acrobatics will almost never comp up when you’re working with RGB graphics (like something created in photoshop), and outputting to the web. Both your source and your output are sRGB… the working color space of computer monitors.