I would also say more info is needed. What to learn depends on your situation. If you are primarily PC based, it would not get you much to learn Unix modules that you may or may not use.

Much of it should be driven by curiosity. What looks interesting. I would not mind playing with CGI but I don't have a need for it at work. They outsourced our website and it was primarily graphic oriented. No ecommerce...

My work tends to be more system and lan based. So Dave Roths Mods and Jendas stuff is what I primarily use.

Explore and play!