There are over 100, 000 WordPress plugins. It can be a difficult job finding the best ones for each functions. I have researched and here are the best for every function.
The Breeze caching plugin is simple and effective. I use it to power BloggingTools and it does a good job. Here some important features you should know.
Google analytics plugins make it easy to insert tracking code and monitor website performance from dashboard. Here are the best Google analytics WordPress Plugins