They smile!

People naturally (and unconsciously) mirror the body language of the person they’re talking to. If you want people to like you, smile at them during a conversation and they will unconsciously return the favor and feel good as a result.

They Know Who To Touch (and They Touch Them)

When you touch someone during a conversation, you release oxytocin in their brain, a neurotransmitter that makes their brain associate you with trust and a slew of other positive feelings. A simple touch on the shoulder, a hug, or a friendly handshake is all it takes to release oxytocin. Of course, you have to touch the right person in the right way to release oxytocin, as unwanted or inappropriate touching has the opposite effect. Just remember, relationships are built not just from words, but also from general feelings about each other. Touching someone appropriately is a great way to show you care.

This is a touchy subject, but human touch is very powerful when employed appropriately. :-) Even a warm handshake produces oxytocin!

Yeah, most of the 13 habits I had seen before in other articles but touching stood out for me.

Like you say, you have to be careful, but appropriate touching really does show you care.