Every time you get a payment, purchase or recordable event smth make a short record: is it a income or expense, choose a category, account number, client, project, or any other info.
The system will automatically calculate all the numbers.
In the and of the day get a report: what is your turnover, profit, how much did you spend for a particular categorie in a particular time frame and many others.
Track all your other files: documents, photos, audio files or just notes, by the easy system of tags you will find all you files within a 5 seconds.