This is the 298th most frequent Turkish word.
buna
"To this" or "this" (dative form).
'Buna' here refers to the book being mentioned, acting as the object of the verb.
Bu kitabı çok beğendim, buna notlar aldım.
I really liked this book, I took notes on this.
'Buna' represents 'this decision,' which is influenced by the weather forecast.
Yarının hava durumuna göre buna karar vereceğim.
I will decide on this according to tomorrow's weather.
'Buna' refers to 'this' concept or situation that is difficult to believe.