The type of led strip light connect have these ways, LED strip to strip, strip to wire, strip to controller, strip to power adapter or power supply, etc.

2 pin LED connector – for warm white, neutral white, cool white, single color red, green, and blue LED strip lights.
3 pin LED connector – for tunable white LED strip light.
4 pin LED connector – for RGB color changing LED strip.
5 pin LED connector – for RGBW LED strip light.
There are some types for non-waterproof strips, other types for waterproof strips. Also need to consider the width of the LED strip, the density of the LEDs on the strip, the power or current of the LED strip, and the current carrying capacity of the connecting wire.