The LET function in Excel allows you to assign names to calculation results or expressions and reuse them within a formula. It enhances performance, readability, and maintainability by avoiding repetition of the same expression.

The LEN function in Excel is used to calculate the number of characters in a given text string, including letters, numbers, symbols, and spaces. It's a simple yet powerful tool used in text analysis, data validation, and cleaning operations.

The RIGHT function in Excel is the mirror of the LEFT function. It allows users to extract a specific number of characters from the end (right side) of a text string. This function is especially useful when dealing with fixed-format codes, dates, or trailing data. Let’s walk through how to use it—from beginner to advanced level—complete with examples and practical tips.