Can't find subdivide for Blender 2.9 I'm a complete noob. I was following this tutorial - https://www.youtube.com/watch?v=mGRt24fYYWU
and nothing happened when I pressed cntrl + 4 so I've been looking for &quot;subdivide&quot; but every tutorial I look for has it in different places that don't seem to exist. For instance it's not in the object context menu when I right click.
In order to use the subdivide tool, you must first be in Edit Mode.

Select the edges you want to subdivide, or hit "a" to select all
Go to "edge" tab in top left next to what mode you are in
Hit "subdivide"

For more reading, here is the Blender Subdivision Documentation
Hope this helps, good luck!