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In the sentence これは[本当]{ほんと}に[高]{たか}いです, meaning "This is really expensive", I'm having trouble understanding the meaning of に, which usually has some connotation of "to", "on", or "at".
This is a phrase presented in Memrise Japanese Level 3, and I'm trying to start understanding the grammatical sense of the phrases.
Adjectives can often be used 'adverbially' (though they are generally not analysed by Japanese grammarians as 副詞) by adding に rather than な or in this case の.
If you really wanted to force a preposition into an English translation of 本当に so that it made more sense, you could say the the に is equivalent to the 'In' in 'In reality'.
に means "to."
e.g.)
あなたに - To you
本当に - To the truth / I will hand this over the truth / truly
