Courses and guides are valuable, but our most direct grant-writing advice has always been this: read the Notice of Funding Opportunity (NOFO) for your proposal as closely and carefully as possible, and align your project narrative with its specific prompts and instructions. Depending on the agency, you may also see it called a Funding Opportunity Announcement (FOA) or, informally, a Request for Proposals (RFP).
This sounds obvious, but it is surprisingly easy to drift away from the specific instructions each federal grant opportunity tells you to meet in order to be successful. Your review should include any rubrics, scoring criteria, and explanations of how reviewers will score your application that you can glean from the NOFO. Then use the agency resources above to fill in the details the NOFO assumes you already know.