Back when dinosaurs roamed the earth and I was young kids played outside ALL of the time. We lived in the woods so we learned about wild edibles.
    If you live in a deciduous forest and know what you're doing, at least in the Spring and Summer it's almost impossible to starve. 
    Acorns have already been discussed in detail so I'll skip them.  Wild fruits all have their own season.  First to get ripe are Mulberries.  They are very plentiful but their season is only a few weeks.  Next there are many varieties of Blueberries and even more of Huckleberries.  Also there are poison berries that grow right next to and resemble Blueberries and Huckleberries. I ate some as a toddler and spent the day barfing my guts up so it's a really good idea to know what the poison berries look like.  Then there are Raspberries and Blackberries.  Late in the Summer there are Choke Cherries.  If you're lucky you can also find Persimmons and Ground Strawberries. 
    Many different lawn type plants or weeds are edible.  You can eat both the leaves and flowers of the Dandelion.  Also the close cousins of Dandelions, what we called Plantain Weeds, are edible. The same with Lemon Grass (That small clover like plant with tiny yellow flowers that tastes like lemonade. It might have a different name in other areas.) White Clover is sweet and good but Red Clover tastes like crap.  Wild Garlic is always abundant.  You can eat the whole plant with that.  Your breath will stink to high heaven though. Sometimes you can find Wild Carrots. For a little extra nutrition you can chew then spit out the ripe seed tops of many varieties of grass. Also you can chew the stalks.
   Wild mushrooms scare the hell out of me.  I don't know what I'm doing with them so I leave them alone.
    The inside bark of Pine Trees was mentioned.  Blue Spruce is the best to eat.  Also the flowers and inside bark of the Sassafras Tree are edible and you can make tea from its roots.
   Down by the water depending on the season the entire Cattail plant is edible and you can eat Water Lily root bulbs.
    Of course hunting, trapping, fishing, etc. are other options that much can be written about.  I'm sure I'm forgetting as much as I'm writing.  The bottom line is that in a survival situation at least in the warmer weather there is plenty to eat in a deciduous forest. Come Winter things get MUCH harder but there is still some wild food to be had.

I'm wanting to (read "trying to convince my girlfriend to let me") set up a cockroach farm, specifically, dubia cockroaches to eat High in protein, easy and cheap to breed and far better for the environment than intensive farming methods. Can be eaten roasted, toasted, fried, as flour, pretty much anyway really. I might also grow mealworms as they are even easier.

Wel I'm thinking they will become the new biowaste bin All the carrot skins, broccoli ends, apple cores, mouldy grapes straight to the cockroaches and then the cockroaches go to me so nothing wasted

Well I'll be experimenting to see what tastes best. Baby powder around the edge of the tub will keep them in. Makes it real slippy for them.

The killing is easy. Leave them in the freezer for a few days. Well I'm thinking, if I do use them for flour, then blending them will deal with all of the preparation issues But yeah I'll be doing lots of experiments to see what works and the best way to make use of them. That is once we move into a place that isn't rented or into a place that would let us have pets

Insects are going to be the future. Mark my words. Cultures all around the world already eat insects and with the sheer amount of space and resources that meat and vegetable protein needs, insects are very quickly going to be not only a viable option but a necessity.

Mayapple is good. The entire plant is poisonous.When the fruit is ripe (it looks like a small lemon) around September it's perfectly edible. It has a taste like strawberry, kiwi and custard  mixed.  You have to fight the animals for it, though.