Beatmatching is the most important fundamental skill in DJing, synchronising two tracks so their beats align and play in time together.
Gradually building difficulty through structured exercises using custom practice tracks, developing the confidence and awareness needed to maintain accurate beatmatching during a mix.
Resisting the common shortcut of relying on sync or visual cues. While easy when self teaching, this removes ownership of the mix and the core enjoyment of DJing. The focus here is training your ear and actively listening rather than staring at a screen and letting the software do the work.