You need to install a french drain around or under your home to prevent
standing water. hopefully you have a low area to redirect it too.

then cxover crawlspace floor with 10 mil poly overlapped and sealed
with tape.

theres disagreement about venting I believe its better and the more
vents the better so trapped moistiure does not accumulate.

Its just hard grunt work thik of it as excellent exercise

Increase the value of your home!

Make CERTAIN all downspouts direct water well away from your home!