The 3-day tax training covers introduction to business tax, gross income, and deductions. Day 1 introduces tax definitions, principles of a good tax system, direct and indirect taxes. It also distinguishes tax avoidance from evasion and explains tax rates. Day 2 defines gross income and its components, accrual of income, income source, capital vs revenue receipts, and exempt amounts. Day 3 states the deductions formula, incurrence of expenditure, capital vs revenue expenditure treatment, specifically allowable deductions, loss treatment, and prohibited deductions.