Beats

As you know a song created by beats.
Mostly they are 1/4 (boem, boem, boem, boem)
and dance music is recognized in patterns of 4x 1/4 (16 beats)

If you understand this your half way there!

Now find the first beat of a song (mostly at the beat of the bass drum) and pause the song.
Now you must analyze the song you already hear.
Try recognize 1/4 and the pattern.
On the first beat of the next pattern you start the other song.

Now go on for beatmatching!