How to Say "bestseller" in Spanish
The Spanish word for “bestseller” is “éxito” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
NounB1
referring to a book

Examples
Esa canción fue el mayor éxito del verano.
That song was the biggest hit of the summer.
El nuevo libro del autor es un éxito de ventas.
The author's new book is a bestseller.
La banda tiene muchos éxitos en su repertorio.
The band has many hits in its repertoire.
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