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.
Sports betting can give you more success in gambling than dice because with sports you can ensure that there is not manipulation of the outcome, you can see the game and witness it and you know what team has a good chance to win.