Design a comprehensive, dynamic spreadsheet for meticulous tracking and analysis of daily sales data. The spreadsheet should include distinct columns for [Date of Sale], [Product Identifier/Name], [Quantity Sold], [Unit Price], [Total Revenue per Product], and [Cumulative Daily Revenue]. The spreadsheet should also utilize automated calculations to accurately deduce [Total Revenue per Product] by multiplying [Quantity Sold] by [Unit Price] and to compute [Cumulative Daily Revenue] by adding up all [Total Revenue per Product] for each day. Additionally, ensure the spreadsheet incorporates conditional formatting to highlight any significant fluctuations in daily sales and revenue, as well as data validation rules for error prevention. Lastly, create a pivot table to summarize the sales data, providing insights on the top-selling products and peak sales periods.

"Make me a spreadsheet for calculating monthly profit and loss with columns for [month], [total expenses], [total revenue], and [profit/loss]."

"Make me a spreadsheet for organizing customer information with columns for [customer name], [email], [phone number], [address], and [purchase history]."

"Make me a spreadsheet for inventory management with columns for [product name], [quantity in stock], [reorder level], [reorder date], and [vendor information]."

"Make me a spreadsheet for product pricing analysis with columns for [product name], [cost price], [selling price], [profit margin], and [competitor pricing]."