der Fakt
fact
A verifiable, indisputable fact or circumstance.
Es ist ein Fakt, dass Wasser bei 100 Grad Celsius kocht.
It is a fact that water boils at 100 degrees Celsius.

fact
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fact
A verifiable, indisputable fact or circumstance.
Es ist ein Fakt, dass Wasser bei 100 Grad Celsius kocht.
It is a fact that water boils at 100 degrees Celsius.

A very common construction is the expression 'Es ist ein Fakt, dass ...' (It is a fact that ...), followed by a subordinate clause that describes the fact.
Es ist ein Fakt, dass die Erdbevölkerung wächst.
It is a fact that the world's population is growing.
The word is often used in the plural ('Fakten', facts). Typical verbs are 'Fakten prüfen' (to check facts), 'Fakten sammeln' (to gather facts), 'Fakten präsentieren' (to present facts), or 'sich auf Fakten stützen' (to rely on facts).
Bevor wir eine Entscheidung treffen, sollten wir alle Fakten prüfen.
Before we make a decision, we should check all the facts.
The idiom 'Fakten schaffen' (to create facts) means to change a situation so that it can no longer be easily reversed. You present others with a fait accompli.
Mit dem Bau der Mauer wollte die Regierung Fakten schaffen.
By building the wall, the government wanted to create facts.
opinion
'die Meinung' and 'der Fakt' stand in an important contrast. An opinion is what someone personally thinks or believes. A fact is something that can be checked or proven. Learners may confuse the words because people sometimes state their opinion very confidently, as if it were a fact. Still, the difference remains important: 'Ich finde das gut' (I think that is good) is an opinion. 'Der Termin ist am Montag' (The appointment is on Monday) is a fact if it is true and can be proven.

Ein wichtiger Fakt ist, dass der Antrag bis Montag abgegeben werden muss.
One important fact is that the application must be submitted by Monday.
Sie hat ihre Meinung über die neue Regel im Meeting offen gesagt.
She openly shared her opinion about the new rule in the meeting.