Learn about Czech on Wikipedia
Discover the Czech Language
If you're learning Czech you may very well want to get an overview of the language, some of its unique features, geographical information about native speakers as well as loads of information on grammar, linguistics, history, diaspora and general language structure.
All of this and more is available in Wikipedia's Czech entry. There are also some interesting links at the bottom which take you to further resources to explore and learn about the language of the Czech Republic.
Also related and useful is the Wikipedia category for the Czech language.
From Wikipedia Czech
Czech (pron.: /ˈtʃɛk/; čeština Czech pronunciation: [ˈt͡ʃɛʃcɪna]) is a West Slavic language with about 12 million native speakers; it is the majority language in the Czech Republic and spoken by Czechs worldwide. The language was known as Bohemian in English until the late 19th century. Czech is similar to and mutually intelligible with Slovak and, to a lesser extent, with other Slavic languages.