An SSD is better than a hard drive but it is considerably more expensive and hard drives have more memory for the money but are not as fast.

inputs and outpurts

Inputs and Outputs

for example a monitor is an output device because it outputs a picture on the screen
a keyboard is an input device because you input the keys you want it to type
a touch screen is both because you input what it does and it shows you what it is doing at the same time.

a controller is also both because you input directions and it vibrates.

binary

binary consists of 0's 1's.
logic gates take in the binary numbers and use them for example the logic gates are:

NOT
if it is 1 it will become 0 if it is 0 it will become 1

OR
two inputs if there is a 1 in it it will be a 1

AND
and is like or but instead if there is a 0 in it it will become a 0