Linked worktrees behave just like a "normal" git repo. You can create new branches, switch branches, delete branches, create tags, etc etc.
BUT there is one thing you cannot do... you cannot work on a branch that is currently checked out by any other working tree (main or linked).
Copy/paste the output of the failed git switch command into the textbox and submit.
This course expects Git's output to be in English. If it is not, you can temporarily set your terminal to English.
export LANG=en_US.UTF-8
You might need to install the language pack for your system, e.g. sudo apt-get install language-pack-en for Ubuntu.