If your hips are tilted then your already in an improper boxing stance. If you don’t feel solid over both feet then you’re in an improper stance.
Don’t put your foot directly in a straight line with each other. Also, don’t cross your feet, or you’ll be unbalanced. Keep your rear heel raised.
If you’re punching with the lead hook your rear leg should be stiff but not locked, like a pole in the ground.
To move more effectively have your weight on the balls of your feet. If you want your weight to be on the heel of your front foot, keep your front leg stiff with the bones in your leg lined up. If your front leg is bent, you will have your weight across your entire front foot instead of your weight just on your heel, which can feel more balanced.