Ableton
If you know nothing about music theory, this is the place to start. Ableton, an instrument maker and community for artists, created the course specifically for beginners to learn music theory for free. It will take you step-by-step through the different stages of music creation. It will teach you the difference between drums, bass, chords, and melodies, and teach you the basics of beats, notes, and scales. If you are a beginner, let's access Ableton's website. You should start with the shortened version video. Everything is available at Ableton's website.
All exercises are interactive, which is great because you are learning by doing. After completing the course, you can move on to advanced topics such as major and minor scales, triads, etc. Ableton's course is notable for how easy it is to understand and how quickly you will learn the nuances of music theory. And all you need is a web browser, nothing more. Ableton lets you try the standard for free for several months. That means some of the tracks you have created will not be saved or exported. You should buy more service packages in combos rather than buying individually. The price will be more favorable.
Website: https://www.ableton.com/