One of the things I enjoy most about working on Salesforce.com is that there is always something new to learn. Three times a year we get some new Cloud functionality, bell, or whistle and they are not the least bit shy about making great big changes. The good news? Those big ones (like Lightning, or Communities a little while back) are really easy to spot and track. The bad news? The veritable Niagara Falls of little tweaks and tunes across every dark corner of the Platform that doesn't show up to the party with much fanfare. For my money, there are a few major parts that see the tiniest changes that can often have a significant impact.