I'm not going to list out a few strategies to claim like these are all effective for profit making in gambling but I'm going to mention about what are the possibilities for your research.

The easiest strategy might have gone the most popular one hence it has become as a common strategy for any gambler like martingale strategy is doing with dicing sites. I mean your criteria for searching strategies based on easiest or popular will not work but what will work ? Your own strategy. You do not need to develop a strategy from scratch. But, you may go for modifying few parameters of few strategy and this may work for you for sometimes until your house will develop their side fix for your strategy.

I believe you may go for developing strategies for your sportbetting as there will be plenty of chances to crack there compared to other gambling. Still, just with knowledge on a sport and players, I do see many people are making easy money out of sportsbetting. Knowledge on sports in their most working strategy.