Questions & Answers about Tato informace je důležitá.
Because informace is a feminine singular noun, and the demonstrative this has to agree with it.
Czech this changes by gender:
So:
- tato informace = this information
- tento dokument = this document
- toto město = this town
The shorter form ten / ta / to usually means that, though in everyday speech it can sometimes overlap with this/that depending on context.
Tato is a demonstrative pronoun/determiner. In this sentence, it works like this in English and directly modifies the noun informace.
It must match the noun in:
- gender
- number
- case
Here it is:
- feminine
- singular
- nominative
because informace is the subject of the sentence.