How to connect LED strip lighting using solder or quick connector - YouTube
VBD-RGBBC-12MM-2S LED Strip to Strip Connector
Armacost Lighting SureLock White LED Tape Light Splice Connector Cord (5-Pack) 560821 - The Home Depot
Nicelux CCT Tunable LED Strip Connector 10mm 3 Pin (5PCS) With 9.8 Feet 20 AWG LED Extension Wire, DIY Both Strip to Power and board to board Jumper, Non-waterproof - Amazon.com