Bad Snacks walks through the first steps of building a bassline in Ableton Live, covering instrument selection and a practical theory shortcut for beginners. She pulls up the Analog synthesizer, auditions the "Muted Dark Bass" preset, and explains how to drag it onto a new MIDI track.
The core tip here is simple but genuinely useful: when you're unsure what notes to play, just use the root note of each chord in your progression. If your chords are F major 7 and C major 7, your bassline starts on F and C. It works because the root anchors the harmony without requiring you to think through voice leading or extensions.