Courses such as "Writing a Proposal" and "Nonprofit Management Foundations" have sections which might prove useful for beginning grant proposal writers.
A variety of free quick tutorials and free & for a fee online short courses for the grant writing novice. Search for "Proposal Writing" on the Candid Learning site for upcoming opportunities.
Though aimed at researchers who will submit proposals to the National Institutes of Health, this free site is a good basic introduction to grant writing.