I need a Google Sheet built so my team and I can type in plain text and numeric values without ever worrying about bad entries slipping through. Everything will be entered manually, but every cell still has to follow clear rules. Here’s what I’m after: • Design the sheet layout with logical headers and frozen rows so it’s easy to navigate. • Add robust data-validation on every input column—drop-downs for controlled lists, custom formulas for numeric ranges, and error messages that actually explain what went wrong. • Include conditional formatting to highlight duplicates or out-of-range numbers at a glance. • Protect any reference cells or formulas so only the intended columns remain editable. • Supply a brief, plain-language guide inside the file (or as a separate doc) that shows users where to click and how the validation works. Optional niceties—if they’re quick for you—would be automatic time-stamps or unique IDs generated with Apps Script, but the core job is the validation framework. Hand over a live Google Sheet ready for immediate use plus the short walkthrough, and we’re done.