You can find instructions on how to install VSCodium on Linux Mint 21 or 20 in a tutorial published by Linux Capable.
How to Install VSCodium on Linux Mint 21 or 20
"Learn how to easily install VSCodium on Linux Mint 21 or 20 with detailed step-by-step instructions and command line terminal. A free and open-source alternative to Visual Studio Code".
How to Install VSCodium on Linux Mint 21 or 20 - LinuxCapable