Modelling Advice Using Boolean I spotted a tutorial on YT, modelling a keyboard Synthesizer. The Instructor (which actually says in the beginning is a novice blender user)is constantly using Boolean Operation to cut into the main shape, saying that Ngons wont matter, and if using another method loop cuts to make quads would take for ever. So would it be any benefit of me watching this tutorial or would it lead me astray from correct 3D modelling approach? Or are the Boolean cuts safe to use as long as there is no subdivision surface modifier applied to the mesh?

Thank you.
There is a great exercise that I came across from a YouTube tutorial by Josh Grambrell who demonstrates a great way to work with Booleans in a non-destructive workflow.
link here: https://www.youtube.com/watch?v=LdQwmfPyuw0
But more importantly to answer your question a little closer, the youtuber gets his reference from an Artstation blog post by Frank Oczur Jr. who talks about different workflows using including subdivision modelling exercises. I'll post he link as well.
https://www.artstation.com/frankpolygon/blog/M7w7/sub-d-hard-surface-modeling-v-block-exercise-amp-tutorial
I won't try explain it myself as I'll probably butcher their work but both are really good reads and a video to watch which might help answer your question.
Hope this helps