Not really! It's quite complicated, I'm not just being difficult, honest! And I'm just putting the tea out too...
The gist is that there's a calm stage, a rumbling stage, a meltdown stage and a coming-down stage (iirc - it's a while since I read it). Ideally you should aim to recognise the signs that he's about to blow and use strategies to help him calm and avoid the meltdown. Once you're in meltdown there's not much you can do but ride it out.
You could also try The Out of Sync Child, which explains a lot of sensory issues. There's another called Volcano In My Tummy, which is a workbook about managing anger, but your lad is too young for that yet, though you might get some ideas from it for how to help him.
There could be so many things that are setting him off, tbh.
I remember a couple of years ago when ds was learning a song for a play in school, they had to do actions similar to YMCA, but he kept getting confused because there was a sign language chart on the wall just ahead of him and he was convinced everyone else but him was doing the letters wrong. It was weeks before we realised this, and all the while he just kept getting crosser and crosser.
Gotta go, tea's ready...