You should have nothing that you won’t resign over.
A small thing.
A big thing.
Even better, start your own thing.
So you won’t have anyone to resign to.
But always have something to fall back on.
Never touch it.
Add to it if your incomings go up.
But it’s your freedom to walk away.
Don’t compromise your ideas or yourself.
Start saving, then never touch it.
The most important place that you will put it is in the back of your head.