tschechisch
Czech
Relating to the Czech Republic, its inhabitants, or the Czech language.
Wir haben im Urlaub viele tschechische Spezialitäten probiert.
We tried many Czech specialties on vacation.

Czech
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Czech
Relating to the Czech Republic, its inhabitants, or the Czech language.
Wir haben im Urlaub viele tschechische Spezialitäten probiert.
We tried many Czech specialties on vacation.

'Tschechisch' (Czech) is the adjective that refers to the country 'Tschechien' (Czechia/the Czech Republic), the inhabitants ('die Tschechen' — the Czechs), and the language.
Die tschechische Hauptstadt Prag ist eine wunderschöne Stadt.
The Czech capital Prague is a beautiful city.
Adjectives derived from geographic names ending in '-isch' are written in lowercase. An exception is when the word is used as the name of the language itself. Then it is treated like a noun and capitalized.
Ich mag tschechisches Essen sehr gerne.
I really like Czech food.
Common combinations are 'tschechisches Bier' (Czech beer), 'die tschechische Grenze' (the Czech border), 'die tschechische Küche' (Czech cuisine), or the currency, 'die tschechische Krone' (the Czech koruna).
An der tschechischen Grenze gab es früher oft lange Wartezeiten.
There used to be long waiting times at the Czech border.
Prague
'tschechisch' and 'Prager' can both fit with the Czech Republic, but they refer to areas of different sizes. 'tschechisch' means the country of the Czech Republic, its people, or the language. 'Prager' means only the city of Prague or something that comes from Prague. The words can be confused because Prague is in the Czech Republic. When you mean the whole country or the language, 'tschechisch' is correct. When you specifically mean Prague, 'Prager' fits better. Also, 'Prager' is not declined when used as an adjective.

Im Kurs lernen wir einfache tschechische Sätze für die Reise.
In the course, we are learning simple Czech sentences for the trip.
Am Wochenende besuchen wir die Prager Altstadt.
At the weekend, we are visiting Prague's Old Town.