Beats
Beats are essentially just certain sounds combined together to make a certain sounding song. There are unlimited combinations you can make especially if you are able to make your own sounds.
In order to make beats you need to use a DAW (Digital Audio Workstation). This gives you the tools you need in order to keep the beat in rhythm and consistant.
There really isnt too much equipment required to be able to produce nice sounding beats. The major things are just a computer, MIDI keyboard, speakers or a nice pair of headphones, and most importantly patience. There is a lot of trial and error in making beats, but the amount of work put in is worth it once you finish. There is nothing better than the feeling you get when you finish a beat that you like.