First: Think about how important the science is to you. Most SF can be broken down into hard, believable science presentation (generally referred to as "SF") and soft, cool-looking but unrealistic science (referred to as "Sci-Fi"). There's some wiggle-room between them, and some famous novels (and novelists) walk the line between them admirably.
Then think about story types that interest you. SF generally gets into: Space exploration; alien encounters; technological developments; psychological exploration; futuristic conflict; futuristic political action/intrigue; futuristic adventure; and futuristic societies.
If you know what you prefer, just mention it online, and the list of potential books for you to read will be supplied to you by myriads of fans.
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