"From the experience" couple of examples from me.

Could you please correct me, if there are misatkes（mistakes)  in (my/these)  sentences?

She knew from experience, not to go with an unknown person (this is acceptable, but the phrasing is awkward.  "a stranger" is better.

She knew from experience, not to go with a stranger.

Peter knew from the prior experience that he'd  better do his homework, rather than try to write it off then copy it from a classmate.<-good.

Peter knew from prior experience, that he'd  better do his homework himself, rather than copy it from a classmate.  <-better. 

As time passed, every person on the internet find learned from the experience, to not  not to download things from unknown sites.

                                                                                                or 

As time passes,  every person on the internet learns from the experience not to  download things from unknown sites.

                                                                                            better still

Experience has taught people not to download things from unknown websites.