What science fiction novels you recommend to someone who has never explored this genre before?

2BR02B by Kurt Vonnegut.

Despite the fact that it's a science fiction short story, you will not be able to forget it for a long time.

Begin with HG Wells. All his works are science fiction. The Time Machine, The Invisible Man, The Island of Doctor Moreau, and The war of the Words are simple to read and easy to understand. Then go for Frankenstein.  

"the spider" , D. Mustafa Mahmoud

in arabic "العنكبوت"