Learn to beat-match two records. This is a necessary skill for any DJ in any genre. Play the first record on one turntable, and use the cue control to listen to the second disc through your headphones. Adjust the pitch control to match the speed, then nudge the platter on the second turntable forward, until the kick and snare drums of both records fall together. Once they're synchronized, wait for an instrumental part of the song, such as the intro, outro, or a breakdown. Slide the crossfader across smoothly from channel one to channel two, gradually fading out the first record and fading up the second.
Master the "Drop-In." Match the tempos of two records as before, but instead of blending the two songs together, find a suitable start point on the second record. It may be the intro, the start of the first verse, or even the first chorus. Hold the record in place using one hand, allowing the turntable to spin underneath. When the first record reaches a logical end point, quickly slam the crossfader over to channel two and release the second record, creating a seamless segue between the two tracks. Make sure to perform this move on the first beat of a measure so that it can produce a dramatic, jarring effect. Also, ensure that it should still be in time, so that the transition doesn't throw off those dancing in the audience. This will require a sharp crossfader curve on your mixer.
Incorporate basic scratching into your mixing. "Cutting In" is similar to "Dropping In" but uses a simple scratch to mark the arrival of the second record. Set up the tempo and cue points just like setting up a Drop-In, but in the four bars before you start the second record, move the crossfader to the center and "jog" the second record back and forth, allowing the first beat of the second track to be heard over the first. The rhythm of this sound is dictated by your hand movements, so it can help to count in the new track, moving your hand with each number, i.e. "One...two...one, two, three, four!" This builds anticipation by "announcing" the arrival of the second track.
Experiment with Beat-Juggling. This is an advanced effect created by playing two records, often two copies of the same record. A number of different effects can be created this way. Play a short loop on the first turntable, then drop in the same loop on the second. As it plays for the second time, rewind the first record to the start of the loop, and move the fader back over as the loop finishes. This creates an endless loop of the same section of music. Hip-hop originator DJ Kool Herc called this a "Merry-go-round" and it's a fundamental part of hip-hop DJing, ideal for MCs to rhyme over.