Shopping for an Intel processor is no joke. There are enough that it can be confusing to buy the right one for your needs, whether you're gaming, working, doing video editing, need something you can overclock, and so on. Luckily this video and spreadsheet — from Linus of LinusTechTips fame — breaks it all down nicely.
The spreadsheet (linked below) is a collection of all of Intel's currently available processors, complete with filters that make it easy to sort out the ones you're not interested in. The video above, on the other hand, is a reference in how to sort the spreadsheet, and Linus's own recommendations for which processors you should consider depending on what it is you're trying to do with your new system.
He recommends if you're building a general-purpose plus gaming workstation, stop at the Intel Core i5 660K, since it's about as powerful as you need, and hits the price-to-performance sweet spot. If you need those extra cores and are a content creator, maybe consider stepping up to the Intel Core i7 6700K. He also offers some step-down picks for people building on a budget, or building workstations without gaming or content creation in mind — stick to the first three minutes of the video for the TL;DR.
If you have the time, hang out for the rest of the video to hear more tips on making sure you don't buy fraudulent processors, spend too much by shopping with the wrong vendor, and what all of those other Intel processors are actually for. Hit the link below for the actual spreadsheet, so you can check it out yourself.