There are many many ways to make cannabis butter. Just ask around and you’ll get different opinions and techniques. There is no “right way” to do it, but this article from Green Flower is a great place to start. It’s an easy guide to make strong cannabutter, which you can dilute to preference later.
“Knowing how to make cannabis butter is important
as it’s the starting point for most cannabis recipes.”
The step by step recipe is here:
How to Make Potent Cannabis Butter