A betting strategy built on martingale doubles the stake after every loss, so that one win recovers everything lost plus the first stake. On paper the plan cannot fail; in practice a run of six or seven losses, which comes sooner than people think, asks for a stake sixty or a hundred times the first one. Table limits or the bankroll end the sequence long before the promised win comes.
Do betting strategies work, then? Staking plans control risk and cannot remove the margin built into every price. The best betting strategies, including the best betting strategy for football or any other sport, come down to picking where the bettor has real knowledge and staking with steady discipline. To create a betting strategy is to write those two parts down: a market to study and a staking rule to follow.
Bankroll management starts with a separate sum set aside for betting and never topped up from rent or savings. The core rules are short: decide the bankroll once, stake a small fixed share on each bet, never chase a loss with a bigger stake, and review the plan on a set day instead of after a bad result. Written down before the first bet, those rules do more for a bettor than any tip ever will.