There will always be a right and a wrong side to your work. Both sides
There will always be a right and a wrong side to your work. Both sides can be attractive. So a more precise term is public side for what the pattern or knitter has chosen as the right side. Generally the private side remains known as the wrong side.
This is not to be confused with the front and back of your work. As you hold the work in your left hand ready to begin a row, the front side is between you and the needle. The back side is on the far side of the needle.
Some patterns like garter stitch, seed stitch, and 1X1 ribbing, or very furry yarns look the same on both sides. Choosing a public side then becomes dependent on other factors. It may be the cast on edge, the seaming edge, or the look of the fur that determines which is the public side. Once a public side is determined, it should be consistent throughout the garment.
Marking the public side becomes is a great idea. A mental note based on which edge the cast on thread appears will work early in the knitting process. As the piece gets longer, tying a ribbon or piece of yarn or a pin to one side becomes a more visible option.