I mostly do sport betting rather than Dice or casino betting, it's hard to say a specific strategy but mostly not betting more than %5 of the bankroll in any bet regardless of how confident you are from it is the best strategy, Of course doing research and picking a good team is important as well..
you can apply a certain strategy on both sportsbetting and casino games but i doubt there would be a significat effect to your winning chance / possibility. in sportsbetting maybe you can get a better effect using startegy but i don't think so in casino games , you would feel like playing in same circle win-lost-lost-lost and lost.