Questions & Answers about Tässä on kahvi, ole hyvä.
Tässä usually means here.
Grammatically, it comes from tämä (this) plus the inessive ending -ssa / -ssä, so its literal sense is something like in this or in here. In everyday Finnish, though, it very often just functions as here.
So in this sentence, tässä introduces something being presented or handed over:
- Tässä on... = Here is...
Finnish normally needs the verb olla (to be) in this kind of sentence.
So:
- Tässä on kahvi = literally Here is coffee / Here is the coffee
This is a very common Finnish structure for presenting something:
- Tässä on avain. = Here is the key.
- Tässä on kirjasi. = Here is your book.
Even if English can sometimes omit the verb in casual speech, Finnish usually does not.