Designing custom adressable RGB PCB
WS2812B LED strips contain just the WS2812 LED/chip packages, with one capacitor (no marking on it, the datasheet will probably have a recommendation) per chip. Ground and +5V go to all chips, data pins daisy-chained (Dout of chip 1 connects to Din of chip2, et)c.
With large amount of chips, separate (parallel) thicker wires are use for GND and +5V.