You will continue to be lost as long as you avoid answering questions.
How many LEDs do you have?
Also how is it wired up? That tutorial is very bad, you can not put 10A through a solderless bread board track, so please show a photograph of how you have wired it up. That tutorial also does not have a large capacitor across the strip's power supply which is needed.
Have you supplied power and ground to both ends of the strip?
30 per step, 12 steps, 360 LEDS total.
But at any one time there are only six LEDs per step lit.
Adafruit's guide doesn't show a capacitor either: https://learn.adafruit.com/digital-led-strip/wiring
None of the tutorials I've read show to do that.
But I can try it if you think that will help.
Sorry if my lack of skills makes me annoying.