1. Berlin U-Bahn (Underground/Subway): The U-Bahn network in Berlin is extensive, efficient, and covers most parts of the city. It is the easiest way to navigate the city, with trains running at frequent intervals.

2. Berlin S-Bahn (Suburban Rail): The S-Bahn connects Berlin with its surrounding areas and is a convenient option for traveling to the suburbs or neighboring towns. It intersects with the U-Bahn at several stations.

3. Tram: Berlin's tram network is well-connected and provides a scenic way to explore the city. Trams run mostly above ground and cover areas not served by the U-Bahn or S-Bahn. They are particularly useful for reaching attractions in the eastern part of the city.

4. Bus: The bus network in Berlin is comprehensive and covers areas where the U-Bahn or S-Bahn might not reach. Buses usually operate frequently and are a good option for traveling to less touristy areas.

5. Regional Trains: If you plan to explore the outskirts of Berlin or venture out to neighboring cities like Potsdam, the regional trains are a convenient choice. These trains operate less frequently compared to the S-Bahn, but offer easy connections to surrounding areas.

6. Bike Sharing: Berlin has an extensive bike-sharing system with stations throughout the city. Renting bikes is a great way to explore Berlin at your own pace, with dedicated bike lanes available for safe riding.

7. Walking: Berlin is a pedestrian-friendly city with many attractions within walking distance of each other. Exploring the city on foot allows you to soak in the ambiance and discover hidden gems along the way.

8. Taxi/Ride-sharing: Taxis are readily available in Berlin, and ride-sharing services like Uber operate in the city as well. Taxis can be convenient for traveling late at night or when you have heavy luggage.

Remember to validate your tickets before boarding public transport, and consider getting a Berlin WelcomeCard for unlimited travel on public transport along with discounts on attractions and services.