Due diligence. That ugly word used before buying real estate, or a business, or anything serious in your life! I didn’t do any before buying this pharmacy except for knowing something called a P&L sheet. Well actually that’s one-third of the pie....the other two essentials are the balance sheet and the cashflow sheet. Yikes. Please do yourself a favour before going into biz to familiarise yourself with these 3 mammoth keys to business accounting.