Think about this question as you go through the information provided:
Why is knowing your key signatures important when playing music?
Here you will find a visual representation of each key signature, along with the whole and half step pattern of the major scale.
Source: Music Theory Fundamentals
An easy way of recognizing key signatures.
Source: Peter Bufano
Here you will find an overview of key signatures. Pay attention to the order of sharps and flats.
Source: musictheory.net