How to get started with Graphviz

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if dot -V (note: capital V) gives a result similar to this

dot -V
dot - graphviz version 5.0.0 (20220707.1540)

You are good to go

Here are two links taht describe how to work with Graphviz:

Here is a mini tutorial on how to create a Graphviz input file:
Using any editor that can create a text file, create a file named first.gv and copy/paste the following (in a known directory):

digraph {
  hello [shape=circle]
  world [color=red]
  hello -> world
}

Then start a cmd window, cd to the above directory and type:
dot -Tpng first.gv > first.png
using Windows File Explorer, display first.png