Everything is a skill.
At least, I believe everything can be a skill.
How can you make anything into a skill?
Be motivated to learn it and improve at it.
Observe it being performed by someone who is highly proficient at it. Ideally source a few different examples.
Break down the skill into a series of the smallest possible steps.
Practice each step until it feels automatic before moving on to the next.
Repeat from the top.
Everything can be a skill.
Caring for others.
When you practice a skill (or a set of skills) for long enough, it becomes art.
Art is the compounding of skills over time.