Put the warm/hot water in a very large bowl.
Dissolve the sugar, vinegar, and salt in the warm water.
Put the yeast in the bowl and wait for it to proof. Meaning, give it about 5 minutes to see if the yeast makes bubbles. That way you have "proof" the yeast is alive and the bread will rise. Even if something goes awry after the proof and your bread is flat, it will still taste quite good. No worries.
Dump in all the flour or flour and oats mixture.
Stir until just mixed - about 25 turns of the spoon. It's going to be sticky and wet.
Cover with a towel and leave it on the counter until it doubles in size. It will take at least 4 hours. I've left it there all day.
Prepare the baking vessel(s). If you are using loaf pans, use 2 standard 9 x 5-inch pans. If you are going to free-form a rustic loaf, grease the baking sheet. If you are making dinner rolls grease a 9 x 13.
Grease your hands, punch down the dough and divide into 2 halves, 2 rustic loaves, or the rolls. The dough is wet and gluey. Work quickly. If you wear disposable food service gloves grease them before punching down the dough.
Preheat the oven to 450 and let the dough rise again (about 30 minutes) while the oven heats.
Pour a cup of hot water into the oven to create steam and quickly put the bread in. Cook 20 -25 minutes at 450. Reduce the heat to 350 and cook another 20 -30 minutes. Cover the tops with foil near the end of cooking if they are getting too brown for your taste.