is this correct then?
Almost, but you have omitted the wire from the 5 V terminal on the LED strip back to the 5 V terminal on the Nano, the 470 Ohm resistor at the data input terminal on the LED strip and the 100 µF capacitor between 5 V and ground at the LED strip itself.
I don't really understand where you're supposed to put the capacitor? by connecting it 1 wire from the capacitor to the 5v going into the led strip then the other wire going into the ground that is also going into the led strip?
And I thought that the Nano would be plugged in was kinda obvious?? I wasn't gonna bother with drawing in a cable.
Sure the LED is upside down but i got it from a library from a random person online, so what do you expect, and im only trying to put out a + and - input, if i wouldn't have had that sketch of a led strip i would just draw a box and have 3 wires sticking out of it and label it as a led strip, and you care alot about the leds being upside down but not about the data wire just disapearing?
However about the Resistor i understand, i just forgot to draw that in
but why is a capacitor needed??
The Capacitor isn't really needed, since there should be a big enough one in the stepdown 15v-5v if it's a good one.
OK i redrew it is this fine now?