If you live somewhere that has the trash collection system of leaving your bins out the night before and then you bring in the bins after their contents have been collected: pay attention to if you have any injured, sick, disabled, and/or elderly neighbors who could use your help bringing in their bins, and offer your help to them. Likewise it's also considerate to check in with these neighbors if they want your help bringing in their packages when they've gotten packages.
At its core, it's all about the golden rule. If you were injured, sick, disabled, and/or elderly and had a neighbor willing to help you with a task you were (currently) struggling with, wouldn't you want the sliver of relief that could bring you?
But in addition, doing small acts of kindness for your neighbors can reap a lot of benefits in the long term. It pays to be on friendly terms with the people who live around you. When you're locked out of your apartment, your phone is either dead or locked in the apartment, and anyone you live with won't be home for hours, these are the people who could help you in such a situation. Or when your car battery is dead and you need a jump. Or when you slip and fall and hurt yourself walking up to your door. Or any countless number of scenarios where you could use help from someone who lives by you.
So help build community around you, and offer help to your neighbors.