Safe to learn and practice means room to make big mistakes. Not just no traffic around, but no ditches or cliff edges or snow covered curbs or narrow roads or lamp posts or such...just wide empty road or big open lot with room to practice and play.
Once you have a handle on what you're doing, then safe to take turns fast with all 4 wheels spinning means nobody right near you, but you can do it with less (not zero!) margin for error in terms of road edges and hazards, if you're confident in your control and judgement.
Be very aware of how much your traction can vary between snow and ice, and even between different textures of snow. If you can't tell exactly what surface the car's weight will be on, be ready for the worst. Don't be that person making emergency crews rescue you from sliding off the road for no good reason. (And especially don't be that person sliding into other people!)
or...just drive a lot slower and initiate no sudden moves until you become more comfortable. It's not that hard to drive in the snow especially if you're not pretending to be in F1...which, even if you had an M3P, you're not...