how do I download Catalina and store it in flash drive

bahman132 Said:

"how do I download Catalina and store it in flash drive"

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Creating a Catalina USB Bootable Installer:

Go here, and follow the instructions for Catalina. Use a Flash Drive of at least 14GB in fee volume. The site to go to: Create a Bootable Installer for macOS - Apple Support

Hello (bahman132) If you want to save your Mac Into a USB Flash Drive you can do so with Time Machine

To Open Time Machine on Your Mac, Click The Apple Logo on the top left of your screen > Settings > General > Time Machine. Make sure that all the DATA on the flash drive is backed up if you want to keep after the backup. Any remaining data that were on the USB would be erased, Also bahman132 can you also specify have much GB (Storage) the USB Flash Drive Does, You can by just Clicking the Blue "Reply" Button and I will get back to you soon