what does 'learn as you go' mean?

What does mean ‘learn as you go’?

You train as you do the job.


To me, “Go” here means to experience, Adm. It can refer either to “do” or to “be”. For example,

A: I don’t know what a father is like.
B: Well, it’s ‘learn as you go’. You will know it well enough when you have a kid.

(It’s like you “train” while doing the “job” of a father)