Finally, after several months of beta testing, Apples new Operating System, El Capitan, is hitting our doorsteps today.
As per the normal advice that goes with Apple OS releases, you are advised to wait after go-live for what is possibly going to be an update of the OS. Some people will wait until the new OS has an update before installing it, but if you are like me, I will be installing mine as soon as possible. Saying that, it is always prudent to backup all your data before embarking on an OS update. iMore has been generous to do a detailed write up on this >>here<<.
OS X El Capitan brings a smarter, smoother, more sophisticated experience to the Mac.
OS X Leopard begat OS X Snow Leopard. OS X Lion begat OS X Mountain Lion. And now OS X Yosemite has begotten OS X El Capitan. Just as the granite monolith is part of the national park yet every bit a landmark in its own right, so is Apple's latest operating system for the Mac. It has the same general design and architecture as what came before, but brings an entirely new level of intelligence, convenience, and polish.
source: iMore.com
Get a great review of the OS from iMore >>here<<