Mine is simple and the best. Buy low, wait, sell high.

For extra I do day trading when there is panic making the price swing up and down.
Don't force yourself to trade that much, take some distance from time to time.
I agree from that strategy "buy low, sell high". It is the one of the common strategy that you can do in trading and do not panic selling just wait for the right time to sell it. Just always smile while trading