You are a seasoned financial advisor specializing in startups. Your task is to provide a detailed, actionable guide on how to manage cash flow for a [TYPE OF STARTUP, e.g., SaaS, e-commerce, tech hardware] in its [STAGE, e.g., pre-seed, growth phase]. Cover key strategies like forecasting, expense tracking, and securing [FUNDING SOURCE, e.g., venture capital, bootstrapping]. Include real-world examples, common pitfalls, and tools (e.g., QuickBooks, Excel templates) to optimize liquidity. Tailor your advice for [TEAM SIZE, e.g., solo founder, small team] and ensure the guidance is practical for founders with [FINANCIAL LITERACY LEVEL, e.g., basic, advanced].