Maybe the question is a bit depressing.
Examples in some books are all wrong, and some books have incorrect concepts. These problems can only be found when they are verified by themselves. I think such books are in this impetuous age, it is a good book. Only when you calm down can you find problems in it. Only when you practice it can you find errors in it. Only those who write books are eligible to be Spam!
Maybe you can get a good book. The above examples are correct.CodeCopy can be used. It may be less time for careful research, or less time for code debugging, or a lack of training opportunities.
Maybe this is self-abuse!
However, when reading a bad book, you may have a bad idea!
If there are so many disappointments in your life, why not consider them differently.
Maybe this is my attitude towards life!
------ Maybe, I already gave in?
------ Maybe, I am still struggling!