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Feeding corn will "heat them up" in the summer and keep them warmer in the winter
The mere digestion of corn will not "heat them up" but as a supplement to their regular ration it can help to keep them warmer in the winter in two ways. The first as a scratch feed through the simple exertion of exercise. This is why I prefer to use it in the morning to get them off their roost and on the ground actively scratching for the grain. Exercise helps to warm the body.
Secondly, the primary source of food calories in a chicken's diet should be carbohydrates. Corn is an abundant source of easily digestible carbs. When they are needing to burn extra calories to keep warm in cold weather corn is a good source of them, along with a modicum of fat in the germ oil. In the heat this is not necessarily a good thing.
Feeding them apples or other fruits will affect egg production
A hen can only consume so much food in a day no different than people. If she's been eating the same ration for a long period of time then suddenly something tasty comes along she's going to eat more of the new tasty food than the boring old compete ration. For a brief period of time it won't have much noticeable affect. Longer periods of time are different. I have a mulberry tree planted in my henyard. When those berries ripen and begin to fall heavily I can see a noticeable decrease in egg production for as long as they last. It's not dramatic, but it is noticeable. As soon as the berries run out egg production returns to normal for that time of year even though the temperature is steadily rising.
Drafts in the coop will cause your chickens to sicken and die
Drafts in the coop will cause frost bit combs
How much of a draft is it and how much moisture build up inside is there? They are interelated. There needs to be sufficient air flow but for single-combed birds there comes a point there can be too much if they are exposed to severe cold weather in the direct wind. That point can come a lot sooner if there is much moisture build up inside so you can definitely go too far in cutting down on ventilation.
Feeding meaties continuously and providing lights for them is the only way to grow them out
Many folks do provide full-time feed availability to their meat birds and in the short-daylight periods of the year they provide additional light. In fact I believe many of the companies that breed the modern Cornish X birds recommend just this.
Disinfecting the coop/waterers/feeders on a regular basis is the only way to prevent disease in the flock
There is no only way to do much of anything in poultry keeping, but keeping waterers and feeders clean can certainly help and if you've got a mite/lice problem cleaning the coop can help a lot too. For many types of diseases cleaning the coop can be an important part of controlling the outbreak.
Eggs must be refridgerated to remain fresh
Fresh for how long? I've proved this to my 4-H kids by direct experiment. We took a day's gathering of eggs, divided them randomly in half and kept one lot in cartons on the kitchen counter and the other half in cartons in the refrigerator. A week later we cracked each egg onto a separate saucer and contrasted and compared them. The difference in yolk height and white thickness was obvious. Eggs kept in a warm environment lose freshness faster than eggs kept in a cooler environment. If your "room temperature" is cool enough then there is no need to refrigerate, but if it's at all warm you'll keep the eggs fresher longer in a cooler environment such as inside of a refrigerator. The commercial egg industry figured this out decades ago.
Eggs must be washed to prevent food contamination/bacteria
Contamination may already be inside of the egg before it's already laid. But for eggs that were otherwise uncontaminated then eggs that are properly washed may well remain uncontaminated longer than eggs that are not. Particularly if they are refrigerated afterwards. This is why the USDA and every state department of agriculture that I am aware of requires this to be done before they can be sold through commercial channels. A hen only has one excretory orifice. It all has to come out of her vent - eggs, manure, and urine. It's not made of Teflon so chances are pretty good that whatever passed through in the recent past will have left traces. Unless you believe you can see things on the microscopic level then what looks clean does not necessarily mean that it is. Wash or don't wash. It's all the same to me, but the folks who have done the actual research on these things long ago recommended washing.
Free ranging is just putting chickens at risk
I suppose one could say the word "just" is the operative term here. Free ranging has many benefits to be sure, but it's not without its hazards as we see from threads being posted pretty much every day (and multiple times a day) of someone losing birds to predators while they were free-ranging. I've lost many a bird myself that way. It DOES put them at risk. So much so that some folks cannot free range their birds at all. But that's not everyone and for many other folks the risks are sufficiently low as to make the benefits worthwhile enough to take the chance.
Feeding chicks medicated feeds is the only way to prevent cocci
Back to the there not being an ONLY way of doing anything in poultry keeping. But especially for folks who are newly come to poultry keeping then using a medicated starter is a great way to protect their birds from cocci.
Schooling an aggressive roo will only cause him to be more aggressive
For some it will do just that. I've had any number of aggressive cock birds over the years. Some I could train out of it, some simply would not learn and became nastier still. Very bird specific. The ones that could not learn soon got the axe or shipped out. The ones that could stayed.
Feeding them their own eggs/shells will make them become "egg eaters"
I'll give you this one. I do not believe it does either.
Square roosts prevent frost bit toes and round roosts do not
I've never heard this before. I believe the material the roost is made is more important than its shape, but then I don't live in an extreme cold climate.
