Do I need to know how to work with WORD “templates” (also called Word templates)?

No. The work is with normal WORD files – like all the ones you have prepared so far…

Does preparing digital forms require training and study time?

Absolutely not. Forms can be prepared by dragging “fields” of intuitive types (single-line text, multi-line text, list box, etc…) into a form, placing them in the appropriate place on the form (also by dragging), and setting values ​​for several of their attributes (title, field Mandatory, etc.)