Resources in the Tabletop Role-Playing section are general purpose gaming materials.

Gamemastering.

By Brian Jamison.  You can read reviews and purchase a print copy of it on Amazon. Available as a free PDF. I love this book.  At 330 pages, it isn’t all that polished. It is just great, practical advice for gamers who are looking for ways to reduce the amount of prep time they put into this hobby. It really resonates with my own style. If world-building weren’t such an important part of this hobby to me, I’d even consider taking Jamison’s advice on mapping (Don’t do it).