
der Rat
advice
A recommendation or suggestion about what someone should do in a particular situation.
Mein Vater hat mir den Rat gegeben, immer ehrlich zu sein.
My father gave me the advice to always be honest.
advice / council
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advice
A recommendation or suggestion about what someone should do in a particular situation.
Mein Vater hat mir den Rat gegeben, immer ehrlich zu sein.
My father gave me the advice to always be honest.

council
A group of people that makes decisions, provides advice, or leads an organization as a committee, e.g. a city council.
Der Rat der Stadt hat über den neuen Bebauungsplan abgestimmt.
The city council voted on the new development plan.

to consult
To ask someone or something for advice or an expert opinion; to consult.
Bei komplizierten Steuerfragen sollte man einen Experten zu Rate ziehen.
For complicated tax questions, you should consult an expert.

to be at a loss
To be completely at a loss and not know what to do next.
Nachdem alle Versuche gescheitert waren, wusste sie sich keinen Rat mehr.
After all attempts had failed, she was completely at a loss.

counselor / adviser
An outdated or formal term for a person who acts as an adviser, often as part of a title.
Der König verließ sich auf seinen engsten Rat.
The king relied on his closest adviser.
'Der Rat' (advice/council) is the noun related to the verb 'raten'. But be careful: 'raten' can mean 'to give advice' or 'to guess something'. 'Der Rat' always refers to the meaning 'to give advice'.
Ich rate dir, das Angebot anzunehmen.
I advise you to accept the offer.
This word has two different plural forms depending on the meaning. The plural of 'Rat' as a recommendation is 'die Ratschläge' (pieces of advice). The plural of 'Rat' as a council or committee is 'die Räte' (councils).
Er gab mir viele gute Ratschläge.
He gave me a lot of good advice.
When 'Rat' (advice) is a recommendation, it is often used with these verbs: 'jemandem einen Rat geben' (to give someone advice), 'einen Rat befolgen' (to follow advice), 'jemanden um Rat fragen' (to ask someone for advice), or 'einen Rat brauchen' (to need advice).
Ich habe seinen Rat befolgt und mich für den Job beworben.
I followed his advice and applied for the job.
In the meaning 'Gremium' (council/committee), 'Rat' is often found in official or political contexts. Examples are 'der Stadtrat' (city council), 'der Betriebsrat' (works council), or 'der Europäische Rat' (European Council).
Der Betriebsrat vertritt die Interessen der Mitarbeiter.
The works council represents the interests of the employees.
The expression 'jemanden oder etwas zu Rate ziehen' means to consult an expert or a source of information. The construction is fixed and is often used in the perfect tense.
Für die Renovierung haben wir einen Architekten zu Rate gezogen.
For the renovation, we consulted an architect.
The idiom 'sich keinen Rat mehr wissen' means that you have absolutely no idea what to do. The verb is reflexive, and the person is the subject.
Als das Auto mitten in der Nacht liegen blieb, wusste er sich keinen Rat mehr.
When the car broke down in the middle of the night, he was completely at a loss.
hint / notice
Both words can help someone arrive at a solution or make a decision. Rat is usually a personal recommendation about what someone should do; Hinweis is more likely to provide information or a clue without directly recommending a particular decision. Use Rat for the recommendation and Hinweis for the helpful information.

Mein Bruder gab mir den Rat, vor der Prüfung jeden Tag zu lernen.
My brother advised me to study every day before the exam.
Ein Hinweis im Lernplan zeigte mir, dass ich vor der Prüfung jeden Tag üben sollte.
A note in the study plan showed me that I should practice every day before the exam.