
sortieren
to sort
To arrange, group, or put objects, data, or information in order according to certain criteria.
Bitte sortiere die Briefe nach dem Postleitzahlen.
Please sort the letters by postal code.
to sort
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to sort
To arrange, group, or put objects, data, or information in order according to certain criteria.
Bitte sortiere die Briefe nach dem Postleitzahlen.
Please sort the letters by postal code.

to collect oneself
To organize one's thoughts or feelings in order to gain clarity or calm down.
Nach dem Streit musste ich mich erst einmal sortieren.
After the argument, I first had to collect myself.
If you want to specify the criterion by which something is being organized, use the preposition 'nach' followed by the dative. This pattern is very common.
Die Kinder sortieren die Bausteine nach der Farbe.
The children are sorting the building blocks by color.
'Sortieren' (to sort) is often used for everyday organizing tasks. Typical objects are 'die Wäsche' (the laundry), 'den Müll' (the trash), 'Fotos' (photos), or 'E-Mails' (emails).
Am Wochenende muss ich unbedingt meine alten Fotos auf dem Computer sortieren.
At the weekend, I absolutely have to sort my old photos on the computer.
The verb can also be used reflexively: 'sich sortieren' (to collect oneself). This means that a person organizes their own thoughts or feelings in order to be able to think clearly again.
Gib mir eine Minute, ich muss mich nach dieser überraschenden Nachricht erst mal sortieren.
Give me a minute; after this surprising news, I first need to collect myself.
to separate
When dealing with waste, both verbs can be used. “Trennen” emphasizes separating different materials from one another, while “sortieren” highlights arranging or grouping them according to specific criteria. Use “trennen” when the waste is put into separate areas, and “sortieren” when the focus is on organization.

Wir sortieren den gesammelten Müll nach Papier, Glas und Restmüll.
We sort the collected waste into paper, glass, and non-recyclable waste.
Wir trennen den Müll in Papier, Glas und Restmüll.
We separate the waste into paper, glass, and non-recyclable waste.