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Tried this with Debian 11 and this was the easiest way to get it done.
1. Open a terminal and start with "su" (password will be asked)
su
2. Next open "/etc/sudoers" so we can edit it
nano /etc/sudoers
3. Add the user you want to give sudo privileges (where "hans" is the username - I placed it right under the same formatted line for the root user)
hans ALL=(ALL:ALL) ALL
4. Save and close (CTRL+X, confirm by pressing "Y").
You should be good to go now.
Test this with for example:
sudo ls
