how to read an old paperback book without damaging the book

i asked this before but got no relevant answers.


i have quite a few old paperback books which i bought 2nd hand from online, in good condition... ive not read any of them yet, but i wondered when i do come to read one of them how to read them without damaging the book? presumably if you open the book too wide the pages *might* fall out?

so is it best to just open the books partially and not full wide open?