Generally speaking, participants can get support when preparing for, and following on from courses from the agency that hosted the course. Instructors may choose to offer their contact details during a course in case you have follow up questions afterwards, but please only use this option within reason.
In the case of all WFP hosted courses listed on this site – if the contact point noted in the course description is firstname.lastname@example.org, then you may also use that email address to access learning support.
Another place to get help is in the Training courses forum on this site. Other members of the community may be able to answer your questions.