my first sifi was Foundation by Asimov.
Which won the 1966 Hugo for the best series ever in 1960, followed by my favourite at the time, the
Lensmen saga. Later I read Aldiss, Asimov, Bester, Blish, Bradbury, Brunner, Dick, Farmer, Heinlein, Harrison, Le Guin, Pohl & Kornbluth, Pangborn, Silverberg, Stapledon, Sturgeon, Vance, van Vogt, ... and many others. There is a lot of crap in SF, of course, but the genre has produced also some of the most intelligent books ever. Take
The Space Merchants, for example, written half a century before Google and Amazon showed up:
businesses have taken the place of governments and now hold all political power. States exist merely to ensure the survival of huge trans-national corporations. Advertising has become hugely aggressive and by far the best-paid profession. Through advertising, the public is constantly deluded into thinking that the quality of life is improved by all the products placed on the market
;)