I'm not an avid Linux user but there is no harm learning some of tricks that only the experienced Linux admin would know. Check out this tips from Mike Chirico. It has 200 over of Linux tips and tricks. From setting and keeping the correct time on your computer, permanently deleting documents with shred, making files "immutable" so that root cannot change or delete, setting up more than one IP address on a single NIC, monitering users and processes, setting log rotate to monthly with 12 months of backups in compressed format, creating passwords for Apache using the htpasswd command, common Perl commands, using cfengine, adding users to groups, finding out which commands are aliased, query program text segment size and data segment size, trusted X11 forwarding, getting information on the hard drive including the current temperature, using Gnuplot, POVRAY and making animated GIFs, monitoring selective traffic with tcpdump and netstat, multiple examples using the find command, getting the most from Bash, plus a lot more.
Another article that I manage to digest from the same author is "Breaking Firewalls with OpenSSH and PuTTY". A very interesting reading material. The article shows you how remote Linux and Windows users can gain access to firewalled samba, mail, and http servers without monkeying the firewall. However the author said that those steps only applicable if you have a valid account on all targeted servers. In other words, to get a valid account is another art of hacking.
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