Breakdown of Když mám teplotu, nejraději odpočívám doma a piji teplý čaj.
Questions & Answers about Když mám teplotu, nejraději odpočívám doma a piji teplý čaj.
Here Když means when: When I have a fever...
It introduces a subordinate clause: Když mám teplotu.
In Czech, když can also sometimes be translated as if, depending on context, but in this sentence when is the most natural translation.
Because Když mám teplotu is a subordinate clause, and Czech normally separates subordinate clauses with a comma.
So the structure is:
This is very similar to English, where we also usually put a comma after an opening when-clause.