Learn Italian: Questa pasticceria fa dolci buonissimi. Ci andiamo stasera? - This pastry shop makes very good desserts. Are we going there tonight?

Ci is a pronoun that means "there." It replaces a location that was just mentioned so you don't have to repeat it. Here, it stands in for "to the pastry shop" (alla pasticceria). Notice that it is placed immediately before the verb andiamo.

Why is it buonissimi instead of just buoni?

The suffix -issimo is added to the end of adjectives to mean "very" or "extremely." Since it describes dolci (a masculine plural noun), the ending changes to match, becoming buonissimi (extremely good).

Where does the word stasera come from?

Stasera is a shortened, combined version of questa sera (this evening). It is written as a single word. You will also see this same pattern in the word stamattina (this morning).

Why isn't there a subject like "noi" (we) in the question?

In Italian, the verb ending usually tells you who the subject is. The -iamo ending on andiamo already means "we go" or "we are going," so adding noi is unnecessary unless you want to add special emphasis.