I won't lie. What I'm going to copy and paste from the website I'm about to link to? I have no idea what it means. BUT--I know it's got to be helpful to some writer out there, somewhere.

If you are ready to design your first RPG adventure, or learn how to improve the adventures you've already got, you've come to the right place. The "Adventure Builder" will cover all the bases, from hooks to background to traps and treasures.

This time out, we'll cover the foundation you need to build a great adventure. It's not the background, the stat blocks, or even the main villain. It's monster selection, and figuring out the size and style of the adventure.