>Knowing how to farm and how to build a house
I like the way you think anon, but learning to build a modern house depends on electricity/civilization, unless your referring to more primitive structures. Even then the global logistical networks have offered people from wealthy country's easy access to all our needs, even the people I know who grow food and raise livestock would mostly likely suffer high casualties if forced to go 100% substance in a year.
Having a large nearby family should be a priority for everyone as well.