
gut
good
Describes high quality, correct execution, or a positive characteristic.
Das ist ein wirklich gutes Buch.
That is a really good book.
good
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good
Describes high quality, correct execution, or a positive characteristic.
Das ist ein wirklich gutes Buch.
That is a really good book.

well
Used as an adverb to describe the manner of an action as positive or skillful; a synonym of 'wohl' (well).
Sie kann sehr gut Klavier spielen.
She can play the piano very well.

well
Describes physical or emotional well-being.
Danke der Nachfrage, mir geht es gut.
Thanks for asking, I'm doing well.

good
Describes something as morally right, decent, or kind.
Es war eine gute Tat, dem alten Mann zu helfen.
It was a good deed to help the old man.

good
Describes something as fitting, suitable, or favorable.
Jetzt ist ein guter Zeitpunkt für eine Pause.
Now is a good time for a break.

a good
Describes a considerable, often unexpectedly large amount or duration; almost a generous amount.
Wir mussten eine gute Stunde auf den Bus warten.
We had to wait a good hour for the bus.

that's enough
A colloquial expression meaning 'enough' and often used to end a discussion or action.
Ist ja gut, du musst dich nicht weiter rechtfertigen.
All right, that's enough, you don't need to justify yourself any further.
When 'gut' (good) is an adjective that describes a noun, it is declined. When it is an adverb that describes a verb, it always remains unchanged in the form 'gut' (well).
Er hat mir einen guten Rat gegeben.
He gave me a good piece of advice.
To talk about well-being, the fixed expression 'es geht jemandem gut' (someone is doing well) is used. The person being talked about is always in the dative.
Wie geht es deinen Eltern?
How are your parents?
In combination with an expression of time or measurement, 'gut' (a good) means something like 'at least' or 'a little more than'. It expresses a generously measured amount.
Die Fahrt zum Flughafen dauert eine gute halbe Stunde.
The drive to the airport takes a good half hour.
The expression 'Ist ja gut' is used colloquially to end a discussion or calm someone down. Here it means 'enough' or 'all right'.
Ist ja gut, ich habe verstanden und werde es tun.
All right, that's enough, I understand and will do it.
In the meaning of 'high quality', 'gut' (good) is often combined with nouns such as 'Arbeit' (work), 'Idee' (idea), 'Qualität' (quality), or 'Ergebnis' (result).
Das war eine wirklich gute Idee von dir.
That was a really good idea of yours.
As an adverb, 'gut' (well) often describes activities such as 'schlafen' (to sleep), 'verstehen' (to understand), 'kennen' (to know), or 'funktionieren' (to work/function).
Ich habe letzte Nacht nicht gut geschlafen.
I didn't sleep well last night.
When 'gut' means 'fitting' or 'suitable', it often appears with words such as 'Gelegenheit' (opportunity), 'Moment' (moment), 'Zeitpunkt' (point in time), or 'Preis' (price).
Das ist eine gute Gelegenheit, um Fragen zu stellen.
This is a good opportunity to ask questions.
probably / well
Gut and wohl can both describe a pleasant state when used with sich fühlen. Gut gives a generally positive assessment of someone’s physical or emotional well-being; wohl emphasizes more strongly that someone feels comfortable and at ease. Gut fits a general improvement, while wohl is especially suitable for personal comfort.

Nach der Behandlung fühlt Lea sich wieder gut.
After the treatment, Lea feels well again.
In dem ruhigen Zimmer fühlt Lea sich wohl.
Lea feels comfortable in the quiet room.