What is a chart of accounts for?
Every transaction has to be recorded somewhere. The chart of accounts is the list of somewheres. It groups accounts into types — assets, liabilities, equity, income and expenses — and gives each a code so that the software knows which report a figure belongs on.
The income and expense accounts feed the profit and loss. The asset, liability and equity accounts feed the balance sheet. Get the chart right and the reports write themselves; get it wrong and a van purchase turns up as an expense or a loan repayment as income.
Most software ships with a sensible default chart. The useful work is trimming it to what your business actually does, and adding the handful of lines you genuinely want to see separately — labour sales apart from materials, say, or one line per van.