Replacing a ceiling rose with a led light without using wire connectors
Taping wires (rather than using proper wire connectors) is a recipe for burning your house down.

Whether it's just two wires or a whole bunch, a taped connection is prone to loosen, and arc, and start fires.

Don't know where you are in the world, but virtually any place with any sort of electrical code, that method will not pass. Regardless of code, you should be interested in not setting your house on fire. Interested enough to use a proper connector type available and approved in your part of the world, rather than "not understanding" but choosing to do electrical work anyway...