-In "getting data from Keep,":tutorial-keep.html#arv-get we downloaded a file from Keep and did some computation with it (specifically, computing the MD5 hash of the complete file). While a straightforward way to accomplish a computational task, there are several obvious drawbacks to this approach:
-* Large files require significant time to download.
-* Very large files may exceed the scratch space of the local disk.
-* We are only able to use the local CPU to process the file.
+h2. Prerequisites
+
+To get the most value out of this guide, you should be comfortable with the following:
+
+# Using a secure shell client such as SSH or PuTTY to log on to a remote server
+# Using the Unix command line shell, Bash
+# Viewing and editing files using a unix text editor such as vi, Emacs, or nano
+# Programming in Python
+# Revision control using Git
+
+We also recommend you read the "Arvados Platform Overview":https://arvados.org/projects/arvados/wiki#Platform-Overview for an introduction and background information about Arvados.