It's crucial to bet on sports you enjoy and understand. Without that, you might end up just chasing losses or making random guesses, which often leads to losing money.
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what are some of the things you do to protect yourself from betting to much?
are you profitable over the long run or you end up losing more often and in bigger amounts than winning?
besides analysis I'd say that keeping track of your bets with a diary is definitely help, this way you have reliable data to check your progress over time
I also think that analyzing your bets is necessary simply to get an idea of how much money you can allocate for your game in the future. Simply because the manner and style of play, including the bet sizes, most likely become approximately the same or grow relatively slowly as the player gains experience. In my opinion, it is rare for anyone to play at a bookmaker with a gradual decrease in the bet size. But there are probably players whose life circumstances simply force them to reduce bets, or even just stop playing.
besides bet size I'd say that it is important to include the date (open and close), risk taken and some comment on your rational for making this bet
any other information you'd include on it?
I think this is valuable information that can help the reader and people new into gambling.
Unfortunately, not all players have such self-control that they will necessarily keep a diary of their games, bets and write down all sorts of notes when they do something non-standard. For this, the player must be too pedantic and, of course, spend time on keeping such a diary. I think that not everyone can cope with such a task and with such gaming behavior. Although I certainly admit that this is a very useful way to monitor and adjust your game in the future. And it is certainly correct, although for many players it is too complicated.