Line a baking pan with parchment paper or use a wide platter for your strawberries.
Use a paper towel to wipe the dirt off the strawberries. If you're worried about pesticides, I'll suggest buying organic. Strawberries have already a lot of moisture, so washing them can retain more water (see NOTE #1).
Leave the leaves attached and lay them on a prepared baking pan or platter while melting the chocolate.
For dark, semi-sweet, or milk chocolate: place them on a heatproof container, and add a tablespoon of butter per cup. Place in a microwave on high for 30 seconds, then check. If the chocolate is still firm, place it back in the microwave for another 30-40 seconds, then remove and stir.
Place back in the microwave for another 1-2 minutes with an increment of 10 seconds every minute. Constantly stirring until melted and smooth.
For the white chocolate: the same process but you're going to add canola or vegetable oil (1 teaspoon per cup of chocolate). Continue stirring until smooth. If you're coloring the white chocolate make sure to use an oil base food coloring for chocolate (see NOTE #2).
When the chocolates are melted and ready for dipping, take the strawberries one at a time. Hold it on top of the leaves and carefully dip it halfway into the melted chocolate.
Place them back on the pan. If you're decorating them with sprinkles, don't wait until they dry out. Sprinkle right away so it properly sticks to the chocolate. Then let it dry.
You can also use a spoon to drizzle melted chocolate on top of your chocolate-covered strawberries but I find that using a decorating bag is much easier and it looks neater (see NOTE #3).
Serve while the strawberries are still fresh.