
das Buch
book
A bound work made up of printed or written pages that exists as a physical or digital object.
Ich lese gerade ein spannendes Buch über die Geschichte Roms.
I'm currently reading an exciting book about the history of Rome.
book
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book
A bound work made up of printed or written pages that exists as a physical or digital object.
Ich lese gerade ein spannendes Buch über die Geschichte Roms.
I'm currently reading an exciting book about the history of Rome.

book
A specific literary or academic work, regardless of its physical form.
„Die Verwandlung“ ist das bekannteste Buch von Kafka.
'The Metamorphosis' is Kafka's best-known book.

to keep books
To systematically record the financial transactions of a business. Usually used in the plural, 'die Bücher' (the books).
Jeder Kaufmann ist gesetzlich verpflichtet, ordentlich Buch zu führen.
Every merchant is legally required to keep proper books.

book
A main section of a larger literary or sacred text, such as the Bible.
Die Schöpfungsgeschichte steht im ersten Buch Mose.
The creation story is in the first book of Moses.
'Buch' (book) is the basis for many compound nouns. If you recognize 'Buch', you can often guess the meaning of words like 'Wörterbuch' (dictionary), 'Kochbuch' (cookbook), or 'Handbuch' (manual).
Ich schlage unbekannte Wörter immer im Wörterbuch nach.
I always look up unfamiliar words in the dictionary.
Common verbs are 'lesen' (to read), 'schreiben' (to write), and 'veröffentlichen' (to publish). To talk about the topic, you use the preposition 'über' (about) with the accusative.
Sie hat ein Buch über das Leben der Bienen geschrieben.
She wrote a book about the life of bees.
The expression 'Buch führen' (to keep books) means to document finances. It is almost always used in the context of business or finance, often also in the plural: 'die Bücher führen' (to keep the books).
Kleine Unternehmen müssen ebenfalls sorgfältig Buch führen.
Small businesses also have to keep careful books.
When 'Buch' (book) refers to a part of a large work such as the Bible, it often appears with an ordinal number, e.g. 'erstes' (first), 'zweites' (second). The context is usually religious or historical.
Die Geschichte von David und Goliath steht im ersten Buch Samuel.
The story of David and Goliath is in the first book of Samuel.
title
Buch and Titel can refer to the same published work in the book trade. Buch refers to the physical or digital book as an object, while Titel refers to the name under which the work is listed and found. Use Buch when talking about buying or reading it, and Titel when referring to its name.

Ich habe das Buch gestern im Buchhandel gekauft.
I bought the book at the bookstore yesterday.
Der Titel des Romans steht auf der Liste des Buchhandels.
The title of the novel is on the bookstore's list.