If your Mac is older than 2012, you cannot install Catalina.
Select your main drive (usually "Macintosh HD") as the destination. Enter your when prompted.
Updating from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a significant jump that modernizes your Mac’s security and feature set. However, the loss of 32-bit app support is a major consideration. If you have critical older software, stay on High Sierra or upgrade to Mojave (10.14) instead. For everyone else, follow this guide carefully, always backup first, and enjoy a newer, faster, and more secure macOS experience.
Go to System Preferences > Time Machine > turn on "Back Up Automatically." Do a manual backup (right-click the Time Machine menu bar icon > "Back Up Now").
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