At the age of 20, many feel that the future is not their concern. However, there are five key rules of life that are worth mastering by the age of 30. This is truly important as it can help avoid many mistakes.

Live within your means and save money. Financial literacy is a crucial skill. At 20, many think they can spend all their savings in a day. But this is a poor strategy; one must always consider the consequences. Don't buy things you can barely afford. Don't compare your wealth to others, as they may be living beyond their means. Having money in the bank is like buying peace of mind. You always know you're ready for any changes in life.

Choose your partner wisely. "Engage your brain" when choosing your significant other. Don't waste time on those you don't like or who offend you. Healthy relationships require effort and development.

Not everyone will love you, and that's okay: It's not worth seeking universal recognition or praise. Value your individuality and don't let others convince you otherwise. Don't try to please everyone and be what others want you to be. Love yourself, but also treat others with respect.

Value time, for it passes quickly. Besides a career, it's important to find time for family, socializing, and relaxation. Maintain balance and don't sacrifice precious moments. Many people later realize that they put in significant effort working from 20 to 30, sacrificing valuable time with family and friends that they can never get back. Achieving a balance between work and personal life is challenging but achievable.

Take care of your health. To avoid problems in your 40s and 50s, take care of your health in your 20s. Avoid excessive alcohol consumption and quit smoking. Harmful habits might seem like mere entertainment in youth, but in more mature years, serious problems can arise from them. Don't skimp on healthcare, and always consult a doctor if something is bothering you. Take care of your body. You'll want it to be in good shape when you're 75, and it's something to take care of much earlier.