From the very beginning of reading crochet diagrams. Over the years, I have done mini-tutorials on this concept but they always left more questions, essentially leaving crocheters to figure out a lot on their own.
This tutorial as created in 2017 with the intention to take it slower but also put in a lot of details about the symbols with comprehending what they mean, how they are used and a lot more. When designing, Mikey uses this method to draw the diagram first before typing in the words.
As you become more familiar with this concept, it’s like reading a second language. In fact, the more you learn them, the more you can pick up other diagrams in other countries as they don’t require English to follow along if you know how to read them. There may be slightly symbol differences but if you know what that the symbols are, you can easily complete the tasks.