FL Studio also provides several paid versions that offer different features depending on your needs. Note that you cannot re-open saved projects after they are closed. We offer you the fully functional and time-unlimited free demo version of FL Studio. You can find handy resources by consulting the Learning section of their website, their dedicated Youtube "Getting started" category, or the online manual that will help you with topics such as the main interfaces, or creating music. It is also possible to import and export MIDI files.
It also includes lots of loops and presets that will help you shape your songs the way you want.
Lots of audio samples: FL Studio comes with lots of audio sample libraries ready to be used with DirectWave, one of the software features.