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The first step in mixing is to select songs with similar BPM (beats per minute). Matching the BPM of the tracks will allow for a smoother transition. Your DJ software allows you to check the BPM of tracks, with the general rule being to mix songs that either share identical BPMs or are very close.
Once you've chosen your songs, load them into the appropriate decks within the software. Deck 1 typically resides on the left and Deck 2 on the right. As a beginner, sticking to just these two decks is recommended to keep things simple.