Hit `Ctrl-Shift-B` (or `Cmd-Shift-B` on OSX) to bring up the Build Tasks window.
![Build Tasks window](/images/build_tasks.png)
There's a lot of options here so let's break it down a bit.
`Build` tasks simply build the program, but do not execute it.
`Run` tasks execute without building.
`Build & Run` tasks build and then execute.
`Framework` means that the game will execute using .NET Framework (or Mono if you are on OSX or Linux).
`Core` means that the game will execute using .NET Core.
FNA recommends developing and shipping using Framework/Mono, but I find the Core debugger to be pretty powerful, so I switch to Core sometimes when I have a tricky bug to track down.
`Debug` means that the game will build in Debug mode.
`Release` means that the game will build in Release mode.
Debug modes are typically larger and slower than `Release` builds, but they allow you to use powerful debugging tools.
When you are shipping your game you should always, always use `Release` mode.
Anyway, for our first run, let's select `Build & Run: Framework Debug`.