best stone for study?

Hi everyone, I'm new to stone healing and since I don't have time to study them, I need quick answers to some questions.

First, what are the best stones to help with study and learning?
Second, what are the best stones for motivation and procrastination?
concentration?
social anxiety and sociability?
spiritual attunement?
shyness and introversion?
forgiveness?
creativity?
confidence?

Is there an optimal color for all the chakras?

Does the size of the stone matter on how strong it affects you?

And lastly, if the stone is imperfect does that affect the quality of the power, meditation, etc, or anything?

And do you have any books on crystal healing youd recommend?