If you wish to execute maintenance tasks for your Ducati ST 3 then it is usually a good plan to own a Workshop Manual for a guide just in case you want to know how you can take off a particular part for example Wheel Bearing and install it again accurately.
Ducati ST 3 Workshop Manuals can offer you identifiable diagnostic guidelines with regards to your automobile so if something is playing up it helps you understand what the problem is and ways to correct it. Then you are able to determine if you can do this on your own or that the job is too big you can actually book your ST 3 in to a local friendly mechanic.
Ducati ST 3 manual