Charles Schwab has an excellent product now called Intelligent Portfolio. It is a portfolio that you design based upon your preferred risk profile. The funds are all high quality low fee exchange traded funds that are specially selected for this product. It is automatically rebalanced , which saves you the work of doing that. It also has the benefit of of automatically harvesting losses to offset gains thereby minimizing taxes. see this for more info:
https://intelligent.schwab.com/
It's truly a "set it and forget it" method of investing. I have half my funds in this and half in my own mix of funds, and the IP outperforms my stuff all the time, so you know what I'll be doing soon!