Mastering 4:1 is essential for running Solo Chambers of Xeric in OSRS - it essentially guarantees you can do the full Olm boss fight in 1 inventory of resources, especially because the final head phase can be such a higher damage dealer.
THIS GUIDE is focussing completely on the mechanical aspect of 4:1 - you enter the room, where do you click? when do you click? how do you click? A lot of other guides lead with the understanding first, and teach you how to 4:1 knowing that - but my guide teaches you how to 4:1, and you can learn how it works afterwords. This is just how I did it, I always struggled learning but when I figured out I can just click here, do this, get this done and learn where to click and when, I began to connect those dots into actually how it works!