GNU/Linux Kali Installing GCC 10.3 – Step by step Guide
How to Install GNU Compiler Collection 10.3.x in Kali GNU/Linux desktop – Step by step Tutorial.
The GCC 10.3 back-ported 178 Bug Fixes to the release compared to GCC 10.2.
Especially relevant: now the GCC 10.3 is available on the default Apt Updates Repository.
Finally, you may be interested instead about How to Install Latest GCC 11.2 from Source on Kali.

1. Terminal Getting Started Guide
How to QuickStart with Command Line on Kali GNU/Linux:
First Update the Apt Repo Sources with:
sudo apt update
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.
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