adding content to networking
fixing tables.
crontab basics

How to list, create, edit and delete cron jobs.  Also describes crontab fields.
Added output of crontab command to file
Changed markdown syntax
cat basics

Includes: to standard output, to another file, and combining files
Fixed typo.  I think it was supposed to be "extracting data", not "estracting data"
Moves datacenter topics to a subdirectory
Added another online git learning resource
Removed a comma, fixed a typo
Fixed syntax to reflect device names, replaced unicode quotes with ascii
Convert literal block to code-block
Added a placeholder for mounting filesystems
Moved filesystem options to be below mounting
Removes double spaces after end of sentence
adds private ip space info, adds fiber info
adding LC and SC connector information.
adding modifications from pull request
title underline too short
added correct syntax for rfc.