Bicycles do not have a lot of periodic maintenance required, besides checking the tire pressure regularly and keeping it towards the max written on the tire itself. Higher tire pressure reduces rolling resistance which makes it easier to ride on the street and will help prevent bending a rim when you hit something.
The only other thing you might consider, short of cleaning it from time to time by wiping it down, is to clean and lubricate the chain, any bike shop will have that for you.
Most modern bikes have sealed bearings that do not require regular greasing.
But a book will give you a better understanding about how everything works, how to adjust derailers, tighten the headset and cranks ect. And some tips on how to change a flat. All of which can be found on youtube too!
Good luck and enjoy!