It was known as Bohemian in English (until the 19th century) after the region Bohemia, itself taking its name from the tribe Boii.
Czech holiday phrases ordered by topic.
Czech Phrases ordered by topic.
How to learn Czech from scratch.
https://freelanguage.org/learn-czech Czech language learning resources.
http://www.lsa.umich.edu/slavic A printer friendly Czech grammar written to cover the first two years of a Czech course. These are extremely comprehensive.
http://www.slovnik.cz An online Czech to English dictionary.