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Power Supply
The power supply is probably one of the most important elements in an LED setup - no power, no light. Therefore you should carefully plan which power supply you need.
This guide will only give you a short overview about how to find the right power supply for your LED strip. There is much more to consider and if you want to know more details, I can recommend this guide on the Adafruit page.
The size of the power supply unit depends on the number of LEDs. A single LED consumes a maximum of 60mA at full brightness white. This results in the following formula:
0.06 (A) * number of LEDs = maximum current (A)
To get the Watt number, the maximum current (A) must be multiplied by the voltage (V).
For 5V LED strips: 5 (V) * maximum current (A) = required Watt (W)
For 12V LED strips: 12 (V) * maximum current (A) = required Watt (W)
However, these values only apply if all LEDs are showing white at full brightness. If you only want to play animations where not all LEDs are on all the time or different colors are displayed, you can use a slightly smaller power supply.