Mixing headroom
When learning how to mix it can be tricky to manage levels of various tracks without clipping the master output.
Instead of using limiters or bringing the master fader down , set your loudest track to -12db, such as a kick drum if dance music or a vocal in other genres for example, and work around that. By the time you finish your mix you should find that you will have around -6db headroom, which is ideal for mastering.
Another technique to achieve this is to use an analyser, such as Voxengo Span, and change the metering to K12. Use the 0 on this meter instead of your DAW to balance your levels and it will also help provide enough headroom.