Multiple cubes as just one object? I'm new to Blender, and am following this tutorial on how to create a nighttime cityscape:
https://www.youtube.com/watch?v=ygGQaQld3mc&amp;t=140s
At around 02:20, he is able to duplicate a lot of cubes but keep them all as part of one object. I was wondering how you would go about duplicating an object but still keep everything as what would appear to be one cube object. I've tried every hotkey I can find to do with duplicating, but all of them seem to create a brand new object, which isn't what I want. I'm currently running Blender 2.82, so maybe it's an outdated thing? I appreciate any help :)
What you're trying to accomplish is achieved in Edit Mode. You can enter the dropdown menu in the menus section of your header, or press Tab. Enter Edit Mode, select all the vertices of the cube, then use Shift-D to duplicate.

Ian Hubert's tutorials are for intermediate users. He operates under the assumption that you are already familiar with the basics of Blender. I recommend following a beginner-friendly tutorial series, then continuing where you left off.