What are all forces the result of?

What do you mean exactly?

Three of the four forces are from the interaction of one or more bosons. The photon for electromagnetic, W+, W-, and Z boson for the weak interaction, and 8 bosons for the strong force.

Certain physical properties of a particle determine whether they can interact with a force. For instance, particles with electric charge can interact with photons and particles with color charge can interact with the 8 gluons of the strong force.

The fourth force, gravity, is currently the odd man out. While gravity has been theorized as an exchange of bosons called gravitons, none have been detected and most would argue there is no correct graviton theory. So, gravity is still a classical theory - from general relativity - where gravity is a particular kind of geometry that constrains objects and fields to follow curved geodesics in spacetime.