For starters:
"Kick him out and change the locks" (you mostly can't just do this - especially not if you jointly own the property).
"You're his common law wife so you are entitled to half of everything" (no, no, no).
"You're entitled to stay in the family home if you separate" (maybe, but probably not).
"Keep all the evidence of him cheating because you'll need it when you negotiate a settlement" (no you won't, and you're wasting your time: the law doesn't care who cheated or why or when).
"Just take the kids and leave him" (it's mostly not that easy).
There's lots of brilliant advice too, obviously - but AIBU to want to bang my head on the desk when people repeatedly trot out a pile of bollocks as if it were fact?