Check out these slides to learn how to install GarageBand on macOS, iPhone, or iPad, or Pro Tools First on PC, and use them to record your tracks!

GarageBand macOS Basics - Installing and Recording
GarageBand iPhone Basics - Installing and Recording
GarageBand iPad Basics - Installing and Recording
Pro Tools First PC Basics - Installing and Recording

Mic Placement Guide

Editing Basics

EQ Basics