Component isolation

First, anything with a tube.

Next, in order of gain, so phono stage.

TBC, it's a real shame there isn't more research and evidence into vibration and solid state devices. Some gear will be more susceptible to microphonics than other gear just by part selection, construction methods, etc.

That being said, the worst bit of kit I ever had was a cheap phono preamp and it would ring like a bell if you rapped on it.

Much else is probably overblown.

Disregard what Elizabeth said. Each individual component may need very different isolation devices.
Are you asking because you don't want to spend on the devices for all your components or simply curious ?