Continuity moves an eighth of the load inward: 1.25 wL at a two-span centre, 1.1 over three. The factors, their limits, and what they change in a takedown.
A slab loads a beam, and the beam passes that load to its end supports as reactions. Here is how to find them by statics, for uniform, triangular and trapezoidal loads.
The foundation reactions are where a takedown ends: the load each column and wall delivers to the ground. Here is how to read them and turn them into foundation design loads.