Probably common knowledge but you can hold V to vertex snap two objects together in Unity.

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@kenney Vertex snapping is coming to Godot as well, which is very exciting!
@pierre_pebble @kenney those are good news! I am tired of using the grid, sometimes I don't know very well how to rotate the nodes to make them coincide exactly. Happened to me with some Kenney stuff too.
@pierre_pebble @kenney I’ve been wanting to try Godot for awhile and honestly expected it to have this already, nice to have something to look forward to I suppose

@ZephyrAuster @pierre_pebble @kenney

It's already available in 4.7 dev 3. :)