“What is a limiter and how do you use one?” A limiter is just a very aggressive compressor that tames the audio peaks and raises the overall level of your home studio mixes.
There are many misconceptions about limiting, especially since the Loudness Wars have been getting more press, and too many people seem to have decided that limiters are actually evil – by definition. A great limiter can invisibly shave off several dB from the waveform of a mix without any audible side effects, especially if the original is good and dynamic, to begin with.
Read more about this here: https://www.audio-issues.com/music-mixing/what-is-a-limiter-how-to-make-better-mixes-mastering/