If you're just starting with sci - fi, try 'The Invisible Man' by H.G. Wells. It's a classic that tells the story of a man who becomes invisible in a very engaging way. 'Do Androids Dream of Electric Sheep?' by Philip K. Dick is also a good pick. It inspired the movie 'Blade Runner' and has some deep philosophical questions about what it means to be human. 'Jurassic Park' by Michael Crichton is another one. It combines science and adventure in a really exciting way.
A great beginner - friendly sci - fi novel is 'A Wrinkle in Time' by Madeleine L'Engle. It's a coming - of - age story set in a science - fictional universe with some really cool concepts like tesseracts. 'Starship Troopers' by Robert A. Heinlein is also good. It has action - packed scenes and explores themes of citizenship and military service. And 'The Martian' by Andy Weir is very accessible. It's about an astronaut stranded on Mars and his struggle to survive.
For beginners, I'd recommend 'The Time Machine' by H.G. Wells. It's a relatively short and easy - to - understand novel that introduced many time - travel concepts. Another good one is 'Fahrenheit 451' by Ray Bradbury. It has a simple yet powerful story about a society that burns books. 'I, Robot' by Isaac Asimov is also great for starters. It has short, engaging stories about robots and the Three Laws of Robotics.