Basic
Needs: food, shelter, and safety.
Public Services: police, firefighters, clean streets, parks, and social enterprises, roads, bridges, highways, access to internet.
Education:
quality schooling from early childhood to high school; availability of
post-secondary education.
Businesses:
entrepreneurs, availability of jobs, access to financial services, diverse
selection of goods and services.
This conceptualization helps me understand how to strengthen and support a community, but to understand how the pillars interact, it's better to visualize the pillars as a pyramid, similar to Maslow's hierarchy of social needs.
The lower levels are the most basic needs of a community, which in turn support the growth of the higher levels. Unlike Maslow's hierarchy, where the upper levels cannot be attained without the lower levels, all levels in the "Pyllarimid (I'm sorry, bad pun)" coexist and interact with each other.
Feedback is highly encouraged. Many individuals have researched this topic to a much greater extent than I have, so it is open to evolve as I gain more experience and insights.

