Some believe you can have diversification by investing in mutual funds. The bottom line is this is still just a mix of stocks... And on top of that - a majority of mutual funds hold only a few heavy-weighted stocks.... A truly diversified portfolio should contain other forms of investments.
The mix you choose will really depend on your situation and your personal understanding of the investments.
Remember, with REIR investing, invest with good information, and the profits will follow.
If your main focus is on stocks, you can choose to split your holdings among the various market sectors to reduce your risk. These sectors include: