what's your opinion about "The Friedman Archives Guide to Sony's A7 IV "

As the title states, what's your opinion about "The Friedman Archives Guide to Sony's A7 IV " is it worth spending 35$ for the book, has any one bought the book earlier?

I am an absolute newbie. so thinking it would be better to get the basics right.

Also is it a good idea to group-buy the book and benefit from it?if any one is willing please DM me.