This book is really popular these days, so I bit. I got it and read it and it is exactly what you expect. A behind the scenes expose of the most incompetent lunatic to ever be elected president of any nation. Trump is obtuse, uncurious, uninteresting and egomaniacal. All he craves is love and adoration from everyone around him yet he offers nothing back. That much is not surprising.
Everyone around him believes him to be an idiot and barely tolerates him. His staff sees their ultimate mission to contain them and protect him from his own stupidity. They manage to do this sometimes, but not very often. This is also not a surprise at all.
How much of what is written int he book true? There's no way to tell, as far as I can see. But the fact that it is plausible says a lot of the shambles that the US has put in place of their government.
The book itself is not particularly well written or edited (hello typos).. but it is fun in a train-wreck sor of way.
It is a recommended reading with a short expiry date. If you read it soon, good on you join the party, if not... there surely will be much better books covering the same subject.