The easiest system for DJs to incorporate harmonic mixing is the Camelot Wheel. This wheel shows you the strongest connections to make for each type of key. All you need to do is work out what key one track is, and then you can see which other keys will match well. There are potential keys Pay attention below ⬇️

𝐍𝐀𝐙𝐀𝐍𝐈𝐍  🎨💻🖼

                                                  
  𝗗𝗶𝗴𝗶𝘁𝗮𝗹 𝗔𝗿𝘁𝗶𝘀𝘁 𝗔𝗻𝗱 𝗔𝗜 𝗗𝗲𝘀𝗶𝗴𝗻𝗲𝗿

For the smallest possible setup, you can get started with just a laptop and the right software. Other simple options include using only two turntables (vinyl or CD) and a mixer.