Question

How do the four fundamental forces work?

Answer 1

The fundamental forces (or fundamental interactions) of physics are the ways that individual particles interact with each other.

Explanation:

The fundamental forces (or fundamental interactions) of physics are the ways that individual particles interact with each other.
These are:
Gravity
Electromagnetism
Weak Interaction (or Weak Nuclear Force)
Strong Interaction (or Strong Nuclear Force)

The description of each one is fascinating and too long for this forum. See the discussion here: https://www.thoughtco.com/what-are-fundamental-forces-of-physics-2699070

An excellent presentation on the topic is here: http://www.phys.unm.edu/~gbtaylor/phys102/lectures/22_forces.pdf