In Germany, a common way to say "good morning" is "Guten Morgen," and a common way to say "good day" is "Guten Tag." These greetings are widely used and considered polite and appropriate when interacting with neighbors or anyone you encounter during the morning or daytime hours.
When meeting neighbors or acquaintances, you can simply greet them with "Guten Morgen" in the morning or "Guten Tag" during the day. These phrases are considered standard and are widely accepted in German-speaking countries as friendly and respectful greetings. Remember to maintain a friendly tone and smile when using these greetings to create a positive impression.