Most of what you need is already built, so reporting work is usually filtering, choosing columns, and saving that arrangement so you never rebuild it. The time to do that is before a funder asks, not during.
This page gathers the articles that settle those decisions. They live in the Setup Guide section of this knowledge base, and cover what to choose and why. The rest of this section covers how to do it.
An article in this knowledge base can only be filed in one section, so the Setup Guide holds them and this page links to them rather than repeating them. You will find them under For administrators, in the Setup Guide, stage 6, Manage.
The report templates and the how-to articles: running each built-in report, filtering, and exporting to Excel, CSV or PDF. Exports inherit whatever column layout you saved, so it is worth reading the articles above first.