Should recessed lights be wired in series or parallel?
Parallel. White to white, black to black throughout. If you wire them in series, you will only get a dim glow based on the number of units you wire in.
How do you daisy chain LED recessed lights?
In the attic, run a wire from over the switch location to the first six-inch light, then to the next and so on until all six-inch lights are daisy-chained to the switch location. Daisy chain the two small lights back to the same location using a separate set of wires.