My 401K was converted to a self directed IRA and I have a Roth. I have a number of stocks, mutual funds, ETF's and bonds. I don't go in for fads or the latest hot pick. I research to the best of my ability, try to stay up on current news and forecasts and invest in companies that make stuff with a track record. Lately I've been looking at companies who did good during the last recession or had a great recovery. I've also moved nearly 30 percent into cash.
I adhere to Warren Buffets strategy when he was getting hammered for not investing in the internet bubble someone asked him why. He said "because I don't understand it". If I can't understand what a company is making or doing or see the logic in it I stay away.