in and on

0How do i use in and on?02br
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00I only know how to use it (in/on)? simple sentence like...02br
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00 The book was drop on the floor. ( means on the top of the floor)02br
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00Im hiding in a secret room. (mean inside the room)02br
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00but how do i use it (in/on)? a sentence if the subject doesnt tell if its (in/on) the(top or inside) like...02br
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00I searched her pictures (in/on) the internet.02br
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00The movie was based (in/on) a comic book.02br
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00And can you please explain why do i need to use (in/on) that subject.02br
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00Im really confuse. Thank You.0-