To those often looking for the biggest learning from married people, here's my biggest one
If you have even the slightest doubt about the person you're unfortunately married to, DO NOT have a kid with them.
Seriously, DON'T! Under NO circumstances go ahead and put yourself in that situation where no matter how badly you need to get out, your child(ren) loving and needing both parents will stop you from freeing yourself from hell.
And before you come after me with your "there's always a way"s and "children are better off in a single but happy parent environment" (not until they're MUCH older) - save it. Doesn't apply in more than most situations.
Thanks for listening