What Should Be Included in Startup Booted Financial Modeling?

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I'm interested in learning how to build Startup Booted Financial Modeling from scratch. Besides revenue projections, what financial metrics should founders include? Should the model contain operating expenses, customer acquisition costs, cash flow forecasts, profit margins, break-even analysis, and runway calculations? I'd like to understand which financial assumptions are most important for bootstrapped startups. If you've created one before, what sections proved most valuable for making business decisions?