loop quantum gravity said:
but why the first editions of books are better than the latest ones?
arent the latest editions more updated than the ones from the past century?
There is nothing to update. What is in the older books is correct. Some topics might go in or out of fashion. The earlier editions were written with a clear purpose. Newer editions often are not. Often newer books will cite previous editions of themselves something like "I made this hard to understand so I could save ten pages for silly stuff I wanted to add see last edition for clear explanation". If the first edition was quite good tinkering is almost sure to make things worse. Let's play new book old book.
New book:has computer and calculator use tips
Old book:has sliderule use tips or only refers to hand calculations
Nb: Lacks important results
ob

as a few results of limited use nowdays
nb:Is obscure and bloated
ob:has clear and concise style
nb

as many trivial problems (now w/ 10000 exercises!)
ob:has helpful problems
nb:uses 8000 pages when 500 would do
ob:uses 800 pages when 800 would do
nb:has pretty pictures
ob:uses figures as needed
nb:$200 brand new
ob:$5 used
nb:assumes reader is moron (is often right)
ob:assumes reader is not moron (is often right)