I think ctrl+z is not ok for long text editing

You are correct that the Ctrl+Z command, which is typically used to undo or revert the most recent action, may not be the most efficient method for editing long text of Calculate your earning. While Ctrl+Z can be useful for undoing small changes, it may become tedious and impractical when working with extensive or complex text editing.

Here are a few alternative approaches you can consider for more efficient long text editing:

1. Use a Text Editor with Advanced Undo/Redo Functionality: Instead of relying solely on the basic undo feature provided by your operating system or text editor, consider using a text editor that offers more advanced undo/redo functionality. Some text editors provide a history of changes, allowing you to navigate through multiple levels of undo and redo. This can be particularly helpful when working with longer text documents.
2. Utilize Version Control Systems: Version control systems like Git can be beneficial for managing changes in long text documents. By committing your changes to a repository, you can track the entire history of modifications, easily revert to previous versions, and collaborate with others on the same document.