
der Ratgeber
guide
A book, magazine, or program that gives practical advice on a particular topic.
Ich habe mir einen Ratgeber über die richtige Geldanlage gekauft.
I bought myself a guide about proper investment.
guide / adviser
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guide
A book, magazine, or program that gives practical advice on a particular topic.
Ich habe mir einen Ratgeber über die richtige Geldanlage gekauft.
I bought myself a guide about proper investment.

adviser
A person who gives another person advice and support.
Mein Vater war in allen Lebenslagen mein wichtigster Ratgeber.
My father was my most important adviser in all situations in life.
The word is made up of "Rat" (advice) and the verb "geben" (to give). A "Ratgeber" is therefore literally someone or something that gives advice. This structure helps you understand both meanings: person and book.
Dieser Finanz-Ratgeber gibt viele nützliche Tipps zum Sparen.
This financial guide gives many useful tips on saving money.
You can tell whether a person or a medium, e.g. a book, is meant from the accompanying verbs and adjectives. Verbs like "lesen" (to read) or "kaufen" (to buy) point to a book, while personal descriptions like "ein guter Freund und Ratgeber" (a good friend and adviser) refer to a person.
Ich habe mir einen Ratgeber über Gartenarbeit gekauft.
I bought myself a guide about gardening.
To indicate the topic of a guide medium, German typically uses the prepositions "über" (+ accusative) or "für".
Sie sucht einen Ratgeber über die Börse.
She is looking for a guide about the stock market.
guide / leader
Both words can refer to a book with practical information. A Führer typically provides information about a particular destination and what it offers, while a Ratgeber mainly helps with a task or problem. Use Führer for travel planning and Ratgeber for practical help on a topic.

Der Ratgeber für den Umzug nennt praktische Tipps für die neue Wohnung.
The guide to moving house offers practical tips for the new apartment.
Der Führer für Berlin nennt gute Museen und günstige Restaurants.
The guidebook to Berlin lists good museums and inexpensive restaurants.