look for ways you can contribute to their well being
look for the ways they are already contributing to yours
get to know people if you see them commonly
stop thinking of people you see as faces on the street and turn them into individuals

some people are not to be trusted but you do not have to trust people to get along with them and to make interacting with them a pleasant experience

say hello and learn names
I'm bad at names okay, it's a learning curve, but it means so much to people

if someone greets you on the street you greet them back
ask how people's days are going
share tidbits about yourself to people
read how to win friends and influence people by Dale Carnegie I'm so serious