Professional tips, tricks, and important points
I use the Assets panel daily and fill it with the things that I use most often for the type of work I do compositing. And as part of the standard flow, I always run through the assets and ask, Can any of these make the piece better?
Whether it is an atmosphere, a lightning strike, or an article texture layer, the goal is not to use them every time, but to remember they are there. If you bury these things in the folders on your computer, you may forget they exist and miss out.
For websites, I make macros for common adjustments that I use; that way, they all look uniform, and it saves me a ton of time. As an example, if you wanted the images to all have a blue tone to them with desaturation, instead of adjusting all of them by hand, simply create a macro to achieve the result. Make sure you make the macro modifiable for adjustments when the macro runs, though.
Many macros are destructive, so make sure you make a copy of the base...