Lazy portfolios are a simple and safe way I've been using for some time to successfully invest in the market. The general idea is to allocate your investments into a few broad funds (usually index funds) proportionally to your desired risk profile and let them sit and grow over time. Once you've purchased your funds at your desired allocations the only action required is to occasionally rebalance them and bring them back to your desired allocations as they change over time. These rebalances can happen at set time intervals (6 months to a year) or at specific triggers based on some other strategy. If your only criteria is that your risk profile adjusts as you get closer to retirement age then you can invest entirely in a target date fund, but if you want more control over when/why/how you rebalance then a lazy portfolio might be for you.