This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Rajeev, this question is too generic to give you proper answers. You reveal almost nothing of what you want to achieve.
The best way to get answers is to pick out one problem you have. Tell us what your problem is, and what steps you tried to solve it.