Excel Conditional Formatting Setup

I have an existing Excel workbook that needs clear, reliable conditional-formatting rules so key values jump out instantly. The task is to build (or tidy up) rules that automatically highlight cells according to the numbers they contain—no other triggers are necessary... (Budget: €8 - €30 EUR, Jobs: Data Analysis, Data Entry, Data Processing, Data Visualization, Excel, Excel Macros, Excel VBA, Visual Basic)