jeweils
each
Refers to each individual element of a group and means 'for each one individually' or 'per item'.
Die Teilnehmer erhalten jeweils eine Urkunde und eine Medaille.
The participants each receive a certificate and a medal.

respectively / each
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each
Refers to each individual element of a group and means 'for each one individually' or 'per item'.
Die Teilnehmer erhalten jeweils eine Urkunde und eine Medaille.
The participants each receive a certificate and a medal.

The adverb 'jeweils' (each/respectively) is made up of 'je' (each) and 'Weile' (time/while). It expresses that something applies to each individual unit or at each individual point in time.
Die Teams bestehen aus jeweils fünf Spielern.
The teams each consist of five players.
As an adverb, 'jeweils' (each/respectively) can stand flexibly in the sentence. In position 1, it introduces the sentence, and the verb follows directly after it. But it can also stand in the middle of the sentence.
Jeweils am Monatsende wird das Gehalt gezahlt.
At the end of each month, the salary is paid.
Make sure that 'jeweils' (each/respectively) is an adverb and never changes its form. It is not declined like an adjective before a noun.
Die beiden Kandidaten bekamen jeweils gleich viele Stimmen.
The two candidates each received the same number of votes.
In the meaning of 'per item' or 'for each one individually', 'jeweils' (each) is often used with numbers, prices, or quantities. It distributes a characteristic across the individual elements of a group.
Die Äpfel kosten 50 Cent, die Birnen jeweils 60 Cent.
The apples cost 50 cents, and the pears 60 cents each.
then
'dann' and 'jeweils' can both refer to a specific time or situation. 'dann' usually describes the next step in a sequence: first something happens, then something else happens. 'jeweils' is used when there are several similar cases, appointments, or situations and you are saying something about each individual case. The words can be confused when talking about repeated processes. If you only mean the next step, 'dann' fits. If you mean 'in each case' or 'at each of these appointments', 'jeweils' is more precise.

Die Kurse beginnen jeweils um neun Uhr und enden um zwölf.
The courses each begin at nine o'clock and end at twelve.
Wir steigen am Bahnhof um und fahren dann mit dem Bus weiter.
We change trains at the station and then continue by bus.