der Buchhändler
bookseller
A person whose job is to sell books, either as an employee or as the owner of a bookstore.
Der Buchhändler meines Vertrauens hat mir einen großartigen Roman empfohlen.
My trusted bookseller recommended a great novel to me.

bookseller
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bookseller
A person whose job is to sell books, either as an employee or as the owner of a bookstore.
Der Buchhändler meines Vertrauens hat mir einen großartigen Roman empfohlen.
My trusted bookseller recommended a great novel to me.

The word is made up of 'Buch' (book) and 'Händler' (dealer / merchant). A 'Händler' is a person who trades in something or sells something. So a bookseller is literally a person who trades in books.
Der Händler auf dem Markt verkauft frisches Gemüse.
The vendor at the market sells fresh vegetables.
'Der Buchhändler' (the bookseller; the person) is closely related to 'die Buchhandlung' (the bookstore; the place). A bookseller typically works in a bookstore.
Ich gehe in die Buchhandlung, um ein Geschenk zu kaufen.
I'm going to the bookstore to buy a gift.
The phrase 'der Buchhändler meines Vertrauens' (my trusted bookseller / the bookseller I trust) is a very common and personal expression. It expresses that you have a special, positive relationship with a particular bookseller and trust their recommendations.
Dieses Buch habe ich auf Empfehlung des Buchhändlers meines Vertrauens gekauft.
I bought this book on the recommendation of my trusted bookseller.
salesman / seller
'der Verkäufer' and 'der Buchhändler' can both be people who sell something professionally. 'Verkäufer' is more general and works for many goods, for example clothing, furniture, or technology. 'Buchhändler' is more specific: this person sells books, usually in a bookstore, and often knows a lot about books. The words can be confused because a bookseller is also a salesman. When it is specifically about books, 'Buchhändler' sounds more precise and more natural.

Der Buchhändler empfiehlt mir einen Roman für die Ferien.
The bookseller recommends a novel for the holidays to me.
Der Verkäufer im Möbelhaus zeigt den Eltern ein günstiges Sofa.
The salesman at the furniture store shows the parents an affordable sofa.