To build sufficient retirement savings, aim to save about 15% of annual income, including employer matches. Start early to benefit from compounding. Prioritize maxing out tax-advantaged accounts like 401(k), IRA, and HSA before taxable accounts. Minimize major expenses such as housing and transportation to free up savings. Capture full employer 401(k) match, invest in low-cost index funds, delay Social Security to age 70, and diversify pre-tax and after-tax accounts. Use the 4% rule for withdrawal planning.