Start by inserting your every estimate, each of your analysis in a table. If you do, after a sufficient number of forecasts made will have a database that would only help you down the chance next event to occur. My database contains the ratio of the number of predicted matches - lost to won. This applies to games completed Over 1.5, Over 2.5 and Over 3.5 goals.
Everyone must decide what to include its own database, depending on how forecasting and market on which the player is focused. Even if your bet is a loser - analyzed. See where you make a mistake and what it could look, did you forget to see it because you read between the lines. Be informed, analyze and record their own database.
The key to success is to build a proper strategy. Analysis and database are an integral part of success!