I often use cheap prefabricated Dupont wires in my Arduino, ESP8266, STM32, or Raspbery Pi projects. This enables "professional" looks without crimping the wires myself.
Here I show five tricks to increase the quality of your projects as well as gain time in cabelling the parts together.
I use only simple aids like Super Glue, tweezers, and empty Dupont housings or shells.

Please watch my update before you purchase a crimping tool:    • #39 SN28B Chinese Crimper  vs Engine...  

Empty shell assortment: http://bit.ly/2lFJXb6