I am new to the Mac also and I have been using MainMenu. I like it a lot because it's simple and effective for cleaning caches, browsing history and cache and doing daily, weekly and monthly maintenance that is done automatically if your computer is on at 3am which mine is not, usually. It does a few other things as well, but another reason I like it is it doesn't have a ton of extra seldom, if ever used features like some of the other applications mentioned.