Dear @ben-edom

Interesting choice of topic.

How do you fire a staff without getting into a court case with the staff after firing?

Surely large companies may have some difficulties with firing the staff. However I've learned that more and more companies do not hire people. They prefer to outsource tasks. So instead being hired, you can expect that you will be requested to open your own business and become self-employed person. You will have to take care of your taxes, health insurance, pension, paid holliday etc. And once every month you will provide your "client" with an invoice.

Document every transgression and offence done by an employee in writing,

That's surely good tip :)

Have a pleasant monday,
Yours, Piotr