der Startpunkt
starting point
The place or marker where a movement, competition, or journey begins.
Der Startpunkt des Marathons befindet sich direkt vor dem Rathaus.
The starting point of the marathon is located directly in front of the town hall.

starting point
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starting point
The place or marker where a movement, competition, or journey begins.
Der Startpunkt des Marathons befindet sich direkt vor dem Rathaus.
The starting point of the marathon is located directly in front of the town hall.

This word is a simple compound made up of 'Start' (start) and 'Punkt' (point). So it literally refers to the point where something starts.
Wir treffen uns eine Stunde vor dem Rennen am Startpunkt.
We are meeting at the starting point one hour before the race.
The preposition 'am' (at the) is used to describe the position. The preposition 'für' (for) indicates what it is the starting point of.
Alle Läufer versammelten sich am Startpunkt.
All the runners gathered at the starting point.
You can recognize the figurative meaning by the fact that it is not about a physical place, but about a beginning in time or in a process. Signal words are often abstract nouns such as 'Diskussion' (discussion), 'Entwicklung' (development), or 'Karriere' (career).
Seine Rede war der Startpunkt für eine hitzige Debatte im Parlament.
His speech was the starting point for a heated debate in parliament.
beginning
'der Anfang' and 'der Startpunkt' can both mean the beginning of something. 'der Anfang' is more general and can refer to time, space, or content. 'der Startpunkt' is more specific: it often means a concrete place where a movement, journey, or competition begins. It can also figuratively mean the starting point for planning or thinking something through. The words can be confused because both mark the beginning. If you mean only the first part, 'Anfang' fits. If a clear point or place of origin is important, 'Startpunkt' fits better.

Der Startpunkt der Wanderung liegt direkt neben dem kleinen Bahnhof.
The starting point of the hike is right next to the small train station.
Du hast den Anfang der Anleitung übersprungen und deshalb einen Schritt vergessen.
You skipped the beginning of the instructions and therefore forgot a step.