I find whatever pork roast is on sale and roast it slowly( with a cup of water, in my Dutch oven lid tightly closed. I add diced onion and a little sage.
Cheaper cuts of pork roast aren't as likely to become dry from overcooking because they are riddled with fat, that will melt and make the meat moist and succulent.
I use my nose to know when the roast is almost done, When it smells delicious in the kitchen, cook for 45 more minutes. Remove to platter and cover loosely with foil. If this doesn't make you confidant, use a meat thermometer. You never want Pork rare. Tricha something.
The leftovers are yummy in sandwiches served with homemade barbecue sauce. I make mine with ketchup, MUCH brown sugar, Worcestershire sauce, some mustard, and a shake or two of soy sauce and a tablespoon of vinegar.
Here is a recipe that is close to how I cook a Pork Roast. I sometimes sear and cook the roast uncovered, but I love using my Dutch oven, IN the oven.
Pork Roast - How to Cook it Moist and Tender - Jamie's Cooking & Recipes
Pork tenderloins are easy peasy, but don't over cook them. They will be dry as the desert.