If you like Classic SciFi, allow me to recommend The Ultimate Science Fiction Mega Collection: 24 of the Best Sci-Fi Books of All Time
It includes 24 public domain works by numerous authors such as Verne, Bradbury, Vonnegut, Wells and others. It includes the initial John Carter of Mars books by Burroughs, War of the Worlds, The Time Machine, and many more.
It also includes one of my favorite stories, The Machine Stops by E M Forster. This story just wows me. It’s about a society that lives in little apartments in huge underground arcologies that are all run by The Machine. It provides everything they need including food and air. While the arcologies are huge, the people never go outside and rarely if ever leave their pods (apartments) or see each other outside of video chats on social media. Many of the people have come to see The Machine as God.
The Machine Stops basically predicts modern social media and all it’s isolating and deleterious effects and it was written in 1928 before the electronic computer was even invented!
I can’t seem to edit my original post but I wanted to another series of classic sci-fi compilations I have. These were published to honor works that were published before the institution of the Nebula Awards.
The Science Fiction Hall of Fame, Vol. 1, 1929-1964 - Includes the Roads Must Roll by Heinlein and Nightfall by Isaac Asimov.
The Science Fiction Hall of Fame, Vol. 2-A - Includes The Marching Morons by C. M. Kornbluth, and Who Goes There by John W. Cambell Jr. Who Goes There is the story on which John Carter’s 1982 film The Thing was based.
The Science Fiction Hall of Fame, Vol. 2-B - The Big Front Yard by Clifford D. Simak, The Martian Way by Asimov. This one also includes The Machine Stops that is included in the first compilation I recommended so there is some overlap.