How do I start investing if I have no experience?

Choose a broker and account type
Open an account at a regulated broker (verify via regulatory databases). Decide on account type: a taxable brokerage account has no contribution limits, while a 401(k) or IRA offers tax advantages if you qualify. Many beginners start with a taxable account.
Learn before you invest heavily
Spend a few weeks reading about stocks, bonds, mutual funds, and ETFs. Understand what you're buying and why. Many brokers offer educational articles and video tutorials. Don't memorize everything; get comfortable with the basics.
Start small and diversified
Invest a small amount (even $100) in a low-cost index fund or ETF covering a broad market. Watch how it moves; get used to price changes. Once comfortable, increase contributions monthly or annually. Diversification and time in the market matter far more than picking winners.