Checkout
--------

[graphviz]
----
digraph {
  edge [style=bold, arrowhead=none, fontname=arial, fontsize=24]
  node [style=bold, shape=folder, fontname=arial, fontsize=24, height=1, width=2]
  wtree [shape=plaintext, label="<working tree>"]
  p1 [label="", width=0, height=0]
  p2 [label="", width=0, height=0]
  git [label=".git", width=2]

  Calculator -> p1
  p1 -> git
  { rank=same; p1; git }

  p1 -> p2
  p2 -> wtree
  { rank=same; p2; wtree }

  git -> wtree [color=red, arrowhead=normal, label=" git checkout", fontcolor=red]
}
----

Checkout

* populate the working tree with the commit you want to start working from