First, wash your mask with hot water when you get it home. Make sure to wash before wearing!
When putting your mask on, using clean hands, touch only the ear loops or the cord, adjust the placement and, if your mask has one, the nose wire. Avoid touching the body of the mask. Pinching the edges or the side trim is OK.
When taking it off, touch only the loops or the cord. If you expect to have to wear it again in the same day, set it face down on a clean paper towel, napkin, or tissue to avoid cross-contamination with the table, and so you can easily access the loops/cord to pick it back up. Or hang it from a hook. If you’re done wearing it for the day, place your used mask immediately in your washing machine or in a container where it won’t contaminate other things or people.
Basically, use the same precautions for the body of your mask that you would for a cutting board that had raw meat on it.
If you have to go out multiple times a week and can’t wash your mask after every use, it is strongly recommended to have multiple masks on hand.
For more information and a visual demonstration of how to put on and take off your mask safely, there are several videos from licensed doctors online. Here’s one of our favorites by Dr. Sydnee McElroy.