
zweit-
second
Indicates position two in an order or ranking. It is always used in declined form (zweiter, zweite, zweites).
Er kam als Zweiter ins Ziel.
He crossed the finish line in second place.
second
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second
Indicates position two in an order or ranking. It is always used in declined form (zweiter, zweite, zweites).
Er kam als Zweiter ins Ziel.
He crossed the finish line in second place.

as a pair
Together with one other person; as a pair.
Wir waren gestern Abend zu zweit im Restaurant.
There were two of us at the restaurant last night.

every other
Expresses a frequency or distribution in which one element is always skipped; alternating.
Bei dieser Umfrage wurde nur jeder zweite Passant befragt.
In this survey, only every other passerby was interviewed.
The word 'zweit-' (second) is often used as a prefix in compound words. It then means 'standing in second place' or 'secondary.'
Hamburg ist die zweitgrößte Stadt Deutschlands.
Hamburg is Germany's second-largest city.
The form 'zweit' does not exist on its own. As an ordinal number, it is always adapted to the gender of the noun and declined: 'der zweite Platz' (second place), 'die zweite Chance' (second chance), 'das zweite Mal' (the second time).
Ich lese gerade das zweite Kapitel.
I'm currently reading the second chapter.
The expression 'zu zweit' means 'as a pair' or 'as a group of two people.' This construction with 'zu' can also be formed with other numbers to indicate the size of a group.
Lass uns den Film zu zweit ansehen.
Let's watch the film as a pair.
The combination 'jeder zweite' (or 'jede zweite', 'jedes zweite') is used to express a frequency of 50% or an alternating order. The adjective 'zweite' is declined in this construction.
Jeder zweite Deutsche besitzt ein Fahrrad.
Every other German owns a bicycle.
two
Zwei states the number of people or things. Zweit-, on the other hand, indicates the position in second place in an order and is inflected, for example as zweiter or zweite. Use zwei when counting and zweit- for a rank or position in an order.

Mein Bruder wurde im Wettbewerb Zweiter.
My brother came second in the competition.
Mein Bruder hat im Wettbewerb zwei Aufgaben richtig gelöst.
My brother answered two tasks correctly in the competition.