Try these sites for some great information that you might use to try new things or enhance your existing skills.

Website Organization and Use
ARRL Many useful regulatory, educational, operating, and technical items and links
AC6V and DX Zone General-interest websites with many links on all phases of ham radio Call sign lookup service and general-interest ham radio portal News, articles, equipment swap-and-shop, product reviews, and mailing lists
Radiowave Propagation Center Real-time information on propagation and solar data
Space Weather Prediction Center Real-time information on space weather and radio communications
TAPR Information on digital data modes and software-defined radio (SDR)
AMSAT The main site for information on amateur satellites
WA7BNM Contest Calendar Contest calendar and log due dates
YOTA (Youngsters On the Air) World-wide group for student and young adult hams, based in Europe Collection of real-time maps showing worldwide activity on any amateur band
DX Summit Worldwide DX spotting network