Before "bankroll management rules" gets an answer, the budget comes first. Every betting strategy rests on two questions: what to bet on, and how much to put on each pick. The second one decides more than most people expect. A sound bankroll and a fixed staking plan keep a bad week from ending the whole budget, while a loose one turns ordinary losing runs into real damage. What follows covers the staking side, where a plan can actually be built.
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 arrives.
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.
Most staking plans set one unit at one or two percent of the bankroll, so a normal pick costs one unit and a strong opinion perhaps two.
No. Chasing a loss with a larger stake breaks the staking plan and turns an ordinary losing run into serious damage to the bankroll.
Yes. A record of every bet, winners and losers alike, shows what the staking plan actually returns and whether stakes have drifted from the units set.
Full Kelly trusts the bettor's own probability estimate completely, and estimates tend to be too kind, so half or a quarter of the formula keeps stakes from growing too large.