Sure. 'The Martian' by Andy Weir is a great start. It has a simple and engaging plot about an astronaut stranded on Mars and his efforts to survive. It's easy to follow and has a lot of scientific details that are interesting. Another good one is 'Ready Player One' by Ernest Cline. It's set in a virtual world full of 80s pop - culture references, which makes it fun and accessible.
I would recommend 'A Wrinkle in Time' by Madeleine L'Engle. It's a story about a girl's journey through time and space to rescue her father. The book has a lot of fantastical elements but is written in a way that is easy for beginners to grasp. 'The Time Machine' by H.G. Wells is also suitable. It's one of the early science fiction works and its concept of time travel is presented in a relatively straightforward manner.
For beginners, 'Fahrenheit 451' by Ray Bradbury is a must - read. It tells a story about a future society where books are banned and burned. It's a short but powerful book that makes you think about censorship and the importance of knowledge. Also, 'I, Robot' by Isaac Asimov is a good choice. It has a collection of short stories that introduce some basic concepts in robotics and artificial intelligence in an easy - to - understand way.