
ab
from
Indicates the starting point of a movement or journey from a place.
Der Zug fährt ab Berlin ohne Umsteigen nach Hamburg.
The train travels from Berlin to Hamburg without changing trains.
from / starting at
ab + dative
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from
Indicates the starting point of a movement or journey from a place.
Der Zug fährt ab Berlin ohne Umsteigen nach Hamburg.
The train travels from Berlin to Hamburg without changing trains.

from
Indicates the point in time, age, or limit from which something applies.
Kinder ab sechs Jahren dürfen den Film sehen.
Children aged six and over are allowed to watch the film.

starting at
Indicates the minimum value from which a price, quantity, or other figure applies.
Die Eintrittskarten kosten ab zwanzig Euro.
Tickets cost from twenty euros.

occasionally
From time to time; occasionally.
Ich gehe ab und zu mit meinen Kollegen essen.
I occasionally go out to eat with my colleagues.
'Ab' (from) is often followed by the dative, especially when an article or pronoun follows. With time expressions without an article, the form often remains unchanged.
Ab dem nächsten Bahnhof fährt der Zug direkt zum Flughafen.
From the next station, the train goes directly to the airport.
In timetables and travel information, 'ab' (from) is often placed directly before the name of a place or station. This indicates the starting point of the connection.
Der Nachtzug ab München erreicht Wien früh am Morgen.
The night train from Munich reaches Vienna early in the morning.
For a point in time or an age, 'ab' (from) is often followed by a specific detail such as a date, time, or year. A noun with an article is in the dative.
Ab dem ersten September gilt der neue Fahrplan.
The new timetable applies from September 1.
In advertisements and sales offers, 'ab' (starting at) is often placed directly before an amount of money to indicate the lowest possible price. The amount is usually given with 'Euro' (euros).
Zimmer gibt es schon ab 75 Euro pro Nacht.
Rooms are available from just 75 euros per night.
In 'ab und zu' (occasionally), 'ab' (from) is part of a fixed expression. The entire expression can usually appear in different positions in the sentence, for example at the beginning of the sentence or after the verb.
Ab und zu besucht sie ihre ehemaligen Nachbarn.
Occasionally, she visits her former neighbors.