Being a good neighbor does not take much effort and it certainly provides plenty of benefits for you. It means fewer complaints from other neighbors, that extra help when you need moving something, or extra resources, like when you run out of butter or milk. It's also a nice opportunity to meet new people and make some friends, so just be a friendly neighbor and everything will work out!
If you want to make an excellent first impression then make sure to introduce yourself to neighbors. Different neighborhoods and buildings have different mentalities, but very rarely will anyone be upset if you take the time to say hello and introduce yourself as a new neighbor. Naturally in the city it's a bit different than in the suburbs. While neighbors are a bit more spread out in the suburbs they tend to be friendlier, with neighborhood barbecues and their kids playing in each other's yards. In the city you don't have that same vibe, but it still can't hurt to knock on your neighbor's door and say hello!
Make sure to continue saying hello now and then, it's simple and easy, and might seem like common sense, but when you see your neighbor be sure to wave or say hi. It's not difficult, but it is quickly forgotten after the first couple weeks of living someplace new, so just keep smiling and waving.
Lastly, remember to send cards at the holidays! You're sending cards out anyway, so why not add a few more to the stack. It's a nice reminder to your neighbors that you care and it helps build a basis for a relationship. Next time you need to borrow a cup of sugar, they might be a bit more willing to share!
In the end, these suggestions may seem appear obvious, we just want to remind everyone that being a friendly neighbor can make all the difference in your life, and in the lives of others.