Chocolate is delicate and needs to be treated carefully! The key to perfectly melting chocolate is to go slow and steady and avoid water contact! Do not exceed 90 degrees F when melting your morsels and avoid using wooden spoons. Always ensure your bowls, spoons, spatulas, etc. are completely dry.
Melt your morsels down to 80-90% melted then stir vigorously to melt the rest of the way. If melted improperly or too fast, chocolate can get hard, clumpy, and “concrete” like. This is called “Seizing”.
This often happens if water comes into contact with the chocolate. Water pulls sugar immediately out of chocolate suspension and causes the chocolate to adhere to itself. Which causes the concrete like texture, leaving the chocolate hard, brittle, and unusable.
Chocolate is not compatible with all oils. As an expert rule of thumb, only chocolate and cocoa butter blend well. Peanut butter, butter, canola oil, ghee, etc, do not fully mix well with chocolate. Keep your chocolate safe from these oils and do not add them to your chocolate when melted.