Info on data line resistors / cable types and lengths

If you are running long runs, why does it sometimes work, and sometimes not? And how can you fix it with just a simple resistor? It depends on how you run the wires and how long.

If you aren’t familiar with Quindor, he’s likely the best resource for LED issues/info out there.
Nice guy, and his Livestreams/YT is great, and his discord is also active and a worthwhile resource