When declaring function you can define metadata for the node. Key function specifiers will be BlueprintPure and BlueprintCallable. BlueprintPure - means the function does not affect the owning object in any way and thus creates a node without Exec pins. BlueprintCallable - makes a function which can be executed in Blueprints - Thus it has Exec pins. DisplayName - full name of the node, shown when you mouse over the node and in the blueprint drop down menu. Its lets you name the node using characters not allowed in C++ function names. CompactNodeTitle - the word(s) that appear on the node. Keywords - the list of keywords that helps you to find node when you search for it using Blueprint drop-down menu. Good example is "Print String" node which you can find also by using keyword "log". Category - the category your node will be under in the Blueprint drop-down menu.