Accounting simply follows the money flowing within, to, and from, a business. It is important to remember that the accounts reflect the finances of the business, not of the owner(s).
There are three basic financial statements which describe the activities and financial state of any business:
It is often helpful to split up funds to show sources - from where money has come - and applications - to where money has gone. Until recently, British balance sheets showed finance or liabilities (sources) on the left and assets (applications) on the right. (The rest of Europe and the US reverse the columns.) Whilst balance sheets now tend to be set out in a single column, it can still be helpful to consider sources and applications separately.

In double entry book keeping every financial transaction requires two entries, normally with each entry in a different ledger and mirroring one another. In other words, the sources and applications need to balance.