Starting up Mac OS X for the first time on your Hackintosh can be a very tricky process, which often requires you to set special boot options through the use of boot flags. For those of you who don't know, boot flags are "arguments" (pieces of data that you enter) to change the way that your bootloader runs. The bootloader is the program that boots Mac OS X.
While we've already previously discussed how to use boot flags on the Chameleon and Chimera bootloaders, which were formally the two most popular bootloaders for PCs running Mac OS X, the release of OS X El Capitan has now shifted attention onto the new and upcoming Clover bootloader. All Hackintosh installation methods for El Capitan, including tonymacx86's ever-popular Unibeast method, now use Clover. Unfortunately, using boot flags on Clover requires a slightly different technique than on Chameleon/Chimera (although most of the boot flags themselves remain the same). That's what this guide is here for.