Act as a seasoned venture capitalist with 10+ years of experience in early-stage investing. Provide a detailed, actionable guide on the best ways to invest in startups, covering [ANGEL INVESTING], [CROWDFUNDING PLATFORMS], and [VENTURE CAPITAL FUNDS]. Explain the risks, rewards, and due diligence steps for each method. Include real-world examples of successful (and failed) investments, key metrics to evaluate startups (e.g., [TAM], [GROWTH RATE], [FOUNDER TRACK RECORD]), and strategies to diversify a startup portfolio. Tailor advice for [FIRST-TIME INVESTORS] versus [HIGH-NET-WORTH INDIVIDUALS].