sale right now. If you have only been out of school a few years, you might not remember what things were like in 2008 or even 2001. Buying the dips has worked the past 6-8 years or so, but be careful about thinking that will always work.
I am different from a lot of people when it comes to investing. I hate the phrase "Don't put all your eggs in one basket." I think the much better way to go is to put them all in one basket and guard the basket with your life. Get good at something and do it over and over and over again.