Need to Start Long term investment

Hi everyone, I’m a 25M, single, looking for guidance on starting my investment journey. I earn around ₹50,000 per month and live in a Tier-1 city. My fixed expenses (rent + groceries) come to roughly ₹20,000, and I spend about ₹10,000 on discretionary expenses like entertainment and occasional trips. I already have health insurance and am planning to take life insurance soon. I’d really appreciate advice on building a long-term investment strategy that suits my income and expense pattern. Additionally, I’d like to understand tax obligations, tax-saving options, and any common mistakes beginners should avoid. Thanks in advance for your help!