WPengine just published a comprehensive guide to WordPress plugins called "The Ultimate Guide to WordPress Plugins". With so many plugins available (Over 50,000 free) as well as paid plugins it can be tough to decide which one to choose for your site. This guide will educate you on the best plugins grouped by category and each plugin recommended has been updated in the last year.
We took the liberty of attaching the guide here or you can visit WPengine and get a copy of the guide yourself but you will need to give them a little info about yourself.
We hope you find it useful and feel free to comment below with any questions.