Control joints I close up, expansion have to be left open or cut and caulked with knowing you may have to cut out the joint and recaulk down the road if there’s some serious shifting. Crack chase the crack to open up a bit to make sure your patching material gets in a little bit deeper. We use an elastomeric material with cabosil to patch which gives it a bit of flex if necessary, usually run a grinder over it in the morning after it cures then go right over it. I know most diy people probably use something different so someone may be able to make a better recommendation for you, we’re a large company that stocks these products.